{"id":2962,"date":"2026-06-13T18:35:35","date_gmt":"2026-06-13T18:35:35","guid":{"rendered":"https:\/\/allenglish4u.com\/grammar-intermediate-unit-9\/"},"modified":"2026-06-13T18:55:06","modified_gmt":"2026-06-13T18:55:06","slug":"grammar-intermediate-unit-9","status":"publish","type":"page","link":"https:\/\/allenglish4u.com\/vi\/grammar-intermediate-unit-9\/","title":{"rendered":"Present Perfect Continuous \u2014 English Grammar in Use (Unit 9)"},"content":{"rendered":"<style>.ae4u-u1{--g1:#0E9F6E;--g2:#057A55;--g3:#0B7A56;--ink:#0E2A22;--mut:#5B7268;--paper:#FBFDFB;--card:#FFFFFF;--line:#E2EFE9;--amber:#F59E0B;--bad:#E0556B;--good:#0E9F6E;--soft:#F1F8F5;\n  font-family:'Plus Jakarta Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);max-width:980px;margin:0 auto;padding:0 18px 60px;-webkit-font-smoothing:antialiased;}\n.ae4u-u1 *{box-sizing:border-box;}\n.ae4u-u1 .serif{font-family:'Fraunces',Georgia,serif;}\n\n\/* ---- Unit hub (intermediate selector) ---- 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.sv-b{width:22px;height:22px;border-radius:50%;color:#fff;font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center;flex:0 0 22px;}\n.ae4u-u1 .sv.ok .sv-b{background:var(--good);}\n.ae4u-u1 .sv.no .sv-b{background:var(--bad);}\n@media(max-width:520px){.ae4u-u1 .sv-grid{grid-template-columns:1fr;}}\n\/* remember box *\/\n.ae4u-u1 .remember{display:flex;gap:12px;align-items:flex-start;background:linear-gradient(135deg,#F1F8F5,#E9F8F1);border:1px solid #C7EAD9;border-radius:14px;padding:15px 17px;}\n.ae4u-u1 .rm-ic{font-size:22px;}\n.ae4u-u1 .remember div{font-size:15px;line-height:1.55;}\n.ae4u-u1 .rm-tag{display:inline-block;font-weight:800;font-size:13px;color:#fff;background:var(--g2);border-radius:7px;padding:1px 8px;}\n\/* qn status + pop *\/\n.ae4u-u1 .qn.ok{background:var(--good);color:#fff;animation:pop .3s ease;}\n.ae4u-u1 .qn.no{background:var(--bad);color:#fff;animation:pop .3s ease;}\n.ae4u-u1 .qn.shown{background:var(--amber);color:#fff;}\n@keyframes pop{0%{transform:scale(.6);}60%{transform:scale(1.25);}100%{transform:scale(1);}}\n\/* celebrate *\/\n.ae4u-u1 .celebrate{display:none;background:linear-gradient(135deg,#057A55,#0E9F6E);color:#fff;border-radius:16px;padding:16px 20px;font-size:17px;font-weight:700;text-align:center;margin-bottom:16px;box-shadow:0 14px 30px -16px rgba(6,61,44,.6);}\n.ae4u-u1 .celebrate.show{display:block;animation:pop .45s ease;}\n\n\/* cross-page live unit chips *\/\n.ae4u-u1 a.unit-chip:not(.live){cursor:pointer;}\n.ae4u-u1 a.unit-chip:not(.live):hover{transform:translateY(-2px);background:rgba(255,255,255,.20);border-color:rgba(255,255,255,.45);}\n.ae4u-u1 .unit-chip .st.live2{background:#34D399;color:#063D2C;}\n<\/style>\n<div class=\"ae4u-u1\"><div class=\"hub\"><div class=\"eyebrow\">English Grammar in Use \u00b7 Murphy<\/div><h2 class=\"serif\">Intermediate Grammar<\/h2><p>Master English grammar one unit at a time. Clear notes, then 40+ interactive exercises with instant feedback \u2014 based on the topics in <i>English Grammar in Use (Intermediate)<\/i>.<\/p><div class=\"units\"><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate\/\"><div class=\"un\">UNIT 1<\/div><div class=\"ut\">Present continuous<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-2\/\"><div class=\"un\">UNIT 2<\/div><div class=\"ut\">Present simple<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-3\/\"><div class=\"un\">UNIT 3<\/div><div class=\"ut\">Continuous or simple?<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-4\/\"><div class=\"un\">UNIT 4<\/div><div class=\"ut\">Action or state?<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-5\/\"><div class=\"un\">UNIT 5<\/div><div class=\"ut\">Past simple<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-6\/\"><div class=\"un\">UNIT 6<\/div><div class=\"ut\">Past continuous<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-7\/\"><div class=\"un\">UNIT 7<\/div><div class=\"ut\">Present perfect<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-8\/\"><div class=\"un\">UNIT 8<\/div><div class=\"ut\">Present perfect<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip live\" href=\"#u1-worksheet\"><div class=\"un\">UNIT 9<\/div><div class=\"ut\">Present perfect cont.<\/div><div class=\"st\">\u25cf You&#8217;re here<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-10\/\"><div class=\"un\">UNIT 10<\/div><div class=\"ut\">Perfect: cont. or simple?<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-11\/\"><div class=\"un\">UNIT 11<\/div><div class=\"ut\">How long\u2026?<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-12\/\"><div class=\"un\">UNIT 12<\/div><div class=\"ut\">For &#038; since<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><\/div><\/div><div id=\"u1-worksheet\"><\/div><div class=\"ws-head\"><div style=\"flex:1 1 260px\"><span class=\"ws-badge\">UNIT 9 \u00b7 Intermediate \u00b7 B1\u2013B2<\/span><h1 class=\"serif\">Present Perfect Continuous<small>&#8220;I have been doing&#8221; \u2014 44 interactive questions<\/small><\/h1><\/div><div class=\"ring-wrap\"><div class=\"ring\"><svg width=\"74\" height=\"74\"><circle cx=\"37\" cy=\"37\" r=\"33\" fill=\"none\" stroke=\"#E2EFE9\" stroke-width=\"7\"\/><circle id=\"ring-fg\" cx=\"37\" cy=\"37\" r=\"33\" fill=\"none\" stroke=\"#0E9F6E\" stroke-width=\"7\" stroke-linecap=\"round\" stroke-dasharray=\"207\" stroke-dashoffset=\"207\"\/><\/svg><div class=\"pct\" id=\"ring-pct\">0%<\/div><\/div><div class=\"ring-lbl\">Correct answers<\/div><\/div><button class=\"btn-reset\">\u21ba Reset<\/button><\/div><div class=\"tabs\"><button class=\"tab active\" data-tab=\"notes\">\ud83d\udcd6 Grammar Notes<\/button><button class=\"tab\" data-tab=\"ex1\">\u270d\ufe0f Ex 1<span class=\"badge\">8<\/span><\/button><button class=\"tab\" data-tab=\"ex2\">\ud83e\udde9 Ex 2<span class=\"badge\">10<\/span><\/button><button class=\"tab\" data-tab=\"ex3\">\ud83d\udd18 Ex 3<span class=\"badge\">8<\/span><\/button><button class=\"tab\" data-tab=\"ex4\">\ud83d\udd00 Ex 4<span class=\"badge\">6<\/span><\/button><button class=\"tab\" data-tab=\"ex5\">\ud83d\udee0\ufe0f Ex 5<span class=\"badge\">6<\/span><\/button><button class=\"tab\" data-tab=\"ex6\">\ud83c\udfa7 Ex 6<span class=\"badge\">6<\/span><\/button><\/div><div id=\"u1-celebrate\" class=\"celebrate\">\ud83c\udf89 Brilliant! You finished all 44 questions of Unit 9!<\/div><div id=\"u1-panels\"><div class=\"panel active\" id=\"panel-notes\"><div class=\"note-block\" style=\"border-bottom:none;padding-top:0\"><div style=\"background:#F1F8F5;border:1px dashed #B7DCCC;border-radius:14px;padding:18px 20px;display:flex;gap:16px;align-items:center;flex-wrap:wrap\"><div style=\"font-size:34px\">\ud83c\udfac<\/div><div style=\"flex:1 1 240px\"><div style=\"font-weight:700;font-size:16px;margin-bottom:3px\">Video lesson \u2014 coming soon<\/div><div style=\"font-size:14px;color:#5B7268;line-height:1.5\">No video for this unit on the <b>All English 4U<\/b> channel yet. Record a short lesson, upload it to YouTube, and we&#8217;ll embed it right here.<\/div><\/div><a href=\"https:\/\/www.youtube.com\/@AllEnglish4U\" target=\"_blank\" rel=\"noopener\" style=\"background:#057A55;color:#fff;text-decoration:none;border-radius:10px;padding:9px 16px;font-weight:700;font-size:14px;white-space:nowrap\">\u25b6 Open channel<\/a><\/div><\/div><h2 style=\"margin-top:6px\">\ud83d\udcd6 Grammar Reference \u2014 Present Perfect Continuous<\/h2><p class=\"instr\">Study the notes, then work through the six exercises.<\/p><div class=\"learn-strip\">\n  <div class=\"ls-item\"><span class=\"ls-ic\">\ud83c\udfaf<\/span><div><b>What you&#8217;ll learn<\/b><span>Activities continuing up to now<\/span><\/div><\/div>\n  <div class=\"ls-item\"><span class=\"ls-ic\">\u23f1\ufe0f<\/span><div><b>~15 min<\/b><span>Notes + 6 exercises<\/span><\/div><\/div>\n  <div class=\"ls-item\"><span class=\"ls-ic\">\u2705<\/span><div><b>44 questions<\/b><span>Instant feedback<\/span><\/div><\/div>\n<\/div>\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">A<\/span> How we form it<\/h3>\n  <div class=\"formula\">\n    <div class=\"fb fb-subj\"><span class=\"fb-lbl\">Ti\u00eau \u0111\u1ec1<\/span><span class=\"fb-eg\">I\/you\/we\/they \u00b7 he\/she\/it<\/span><\/div>\n    <span class=\"fb-op\">+<\/span>\n    <div class=\"fb fb-aux\"><span class=\"fb-lbl\">have\/has been<\/span><span class=\"fb-eg\">have been \u00b7 has been<\/span><\/div>\n    <span class=\"fb-op\">+<\/span>\n    <div class=\"fb fb-verb\"><span class=\"fb-lbl\">verb + -ing<\/span><span class=\"fb-eg\">waiting<\/span><\/div>\n  <\/div>\n  <div class=\"form-table\">\n    <div class=\"form-row\"><span class=\"form-pos\">+<\/span> I<b>&#8216;ve been<\/b> waiting \u00b7 she<b>&#8216;s been<\/b> waiting<\/div>\n    <div class=\"form-row\"><span class=\"form-q\">?<\/span> <b>How long have<\/b> you been waiting?<\/div>\n  <\/div>\n<\/div>\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">B<\/span> An activity continuing up to now<\/h3>\n  <p>It started in the past and is <b>still happening<\/b> (or has just stopped). It focuses on the <b>activity and its duration<\/b>.<\/p>\n  <div class=\"timeline\">\n    <svg viewbox=\"0 0 620 130\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Timeline: present perfect continuous \u2014 activity from past up to now\">\n      <defs><lineargradient id=\"barg9\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"0\"><stop offset=\"0\" stop-color=\"#34D399\"\/><stop offset=\"1\" stop-color=\"#0E9F6E\"\/><\/lineargradient><\/defs>\n      <rect x=\"120\" y=\"58\" width=\"350\" height=\"26\" rx=\"13\" fill=\"url(#barg9)\"\/>\n      <text x=\"295\" y=\"76\" text-anchor=\"middle\" fill=\"#fff\" font-size=\"14\" font-weight=\"700\" font-family=\"Plus Jakarta Sans, sans-serif\">I&#8217;ve been waiting<\/text>\n      <line x1=\"20\" y1=\"100\" x2=\"600\" y2=\"100\" stroke=\"#0E2A22\" stroke-width=\"2\"\/>\n      <polygon points=\"600,100 588,94 588,106\" fill=\"#0E2A22\"\/>\n      <line x1=\"470\" y1=\"50\" x2=\"470\" y2=\"100\" stroke=\"#F59E0B\" stroke-width=\"3\"\/>\n      <text x=\"470\" y=\"44\" text-anchor=\"middle\" fill=\"#B4790B\" font-size=\"13\" font-weight=\"800\" font-family=\"Plus Jakarta Sans, sans-serif\">NOW (still going)<\/text>\n      <text x=\"120\" y=\"118\" fill=\"#5B7268\" font-size=\"12.5\" font-family=\"Plus Jakarta Sans, sans-serif\">for an hour \/ since 2pm<\/text>\n    <\/svg>\n  <\/div>\n  <div class=\"chips\"><span>for<\/span><span>since<\/span><span>How long\u2026?<\/span><span>all day<\/span><span>recently<\/span><span>lately<\/span><\/div>\n<\/div>\n<div class=\"note-block warn\">\n  <h3><span class=\"note-tag\">C<\/span> Continuous vs simple perfect<\/h3>\n  <div class=\"sv-grid\">\n    <div class=\"sv ok\"><span class=\"sv-b\">\u23f3<\/span> I&#8217;ve <b>been reading<\/b> all day. <i>(activity\/duration)<\/i><\/div>\n    <div class=\"sv ok\"><span class=\"sv-b\">#<\/span> I&#8217;ve <b>read<\/b> this book twice. <i>(how many \u2192 simple)<\/i><\/div>\n    <div class=\"sv ok\"><span class=\"sv-b\">\ud83d\udca7<\/span> It&#8217;s <b>been raining<\/b>. <i>(recent result: wet ground)<\/i><\/div>\n    <div class=\"sv no\"><span class=\"sv-b\">\u2717<\/span> <s>I&#8217;ve been knowing him.<\/s> \u2192 state verb: I&#8217;ve <b>known<\/b> him.<\/div>\n  <\/div>\n<\/div>\n<div class=\"note-block\">\n  <div class=\"remember\"><span class=\"rm-ic\">\ud83d\udccc<\/span>\n    <div><b>Remember<\/b> \u2014 <span class=\"rm-tag pos\">have\/has been + -ing<\/span> = an activity that started in the past and continues up to now (or just stopped). Ask <i>How long\u2026?<\/i> with <i>for \/ since<\/i>.<\/div>\n  <\/div>\n<\/div>\n<div class=\"check-bar\"><button class=\"nav-next\" data-next=\"notes\" style=\"margin-left:0\">Start Exercise 1 \u2192<\/button><\/div><\/div><\/div><p class=\"src-note\">Made with care for English learners \u00b7 <b>allenglish4u.com<\/b><br>Original practice material inspired by the <i>English Grammar in Use<\/i> syllabus (Cambridge University Press). Example sentences and exercises are written by All English 4U.<\/p><\/div>\n<script>window.AE4U_U1_DATA=JSON.parse(decodeURIComponent(escape(atob(\"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id='ae4u-gfont';if(!document.getElementById(id)){var l=document.createElement('link');l.id=id;l.rel='stylesheet';l.href='https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Fraunces:opsz,wght@9..144,600;9..144,700&display=swap';document.head.appendChild(l);}}catch(e){}})();
(function(){
  var DATA = window.AE4U_U1_DATA;
  var root = document.querySelector('.ae4u-u1');
  if(!root || !DATA) return;
  var TOTAL = DATA.unit.total;
  var state = {};   // itemKey -> 'ok' | 'no' | 'shown'

  function norm(s){
    if(s==null) return "";
    return String(s).toLowerCase()
      .replace(/[’‘']/g,"'")
      .replace(/\s+/g," ")
      .replace(/[.!?,;:]+$/,"")
      .trim();
  }
  function match(val, answers){
    var n = norm(val);
    if(!n) return false;
    for(var i=0;i<answers.length;i++){ if(norm(answers[i])===n) return true; }
    return false;
  }
  function esc(s){return String(s).replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");}

  // ---------- render panels ----------
  var panelsWrap = root.querySelector('#u1-panels');
  DATA.exercises.forEach(function(ex){
    var p = document.createElement('div');
    p.className='panel'; p.id='panel-'+ex.id; p.dataset.ex=ex.id;
    var h='<h2>'+ex.icon+' '+esc(ex.title.replace(/^Exercise \d+ — /,''))+'</h2><p class="instr">'+ex.instr+'</p><div class="items">';
    ex.items.forEach(function(it,idx){ h+=renderItem(ex,it,idx); });
    h+='</div><div class="check-bar"><button class="btn-check" data-ex="'+ex.id+'">Check answers ✓</button><span class="ex-score" id="score-'+ex.id+'"></span><button class="nav-next" data-next="'+ex.id+'">Next →</button></div>';
    p.innerHTML=h;
    panelsWrap.appendChild(p);
  });

  function renderItem(ex,it,idx){
    var key=ex.id+'-'+idx, n=idx+1;
    var s='<div class="item" data-key="'+key+'" data-type="'+ex.type+'">';
    s+='<span class="qn">'+n+'</span>';
    if(ex.type==='spell'){
      s+='<span class="qtext"><span class="base">'+esc(it.base)+'</span> <span class="arrow">→</span> <input class="gap" data-key="'+key+'" autocomplete="off" spellcheck="false"></span>';
    } else if(ex.type==='gap'){
      s+='<span class="qtext">'+esc(it.pre)+' <input class="gap" data-key="'+key+'" autocomplete="off" spellcheck="false"> <span class="hint">'+esc(it.hint)+'</span> '+esc(it.post)+'</span>';
    } else if(ex.type==='mcq'){
      s+='<span class="qtext">'+esc(it.q)+'</span><div class="mcq-opts" data-key="'+key+'">';
      it.opts.forEach(function(o,oi){ s+='<button class="opt" data-oi="'+oi+'">'+esc(o)+'</button>'; });
      s+='</div>';
    } else if(ex.type==='order'){
      s+='<span class="qtext" style="flex-basis:100%"></span><div class="ord-build" data-key="'+key+'"></div><div class="ord-bank" data-key="'+key+'">';
      it.words.forEach(function(w,wi){ s+='<button class="word" data-w="'+esc(w)+'">'+esc(w)+'</button>'; });
      s+='</div>';
    } else if(ex.type==='fix'){
      s+='<span class="qtext"><s style="color:#94a3a0">'+esc(it.sentence)+'</s> &nbsp;→&nbsp; <input class="gap" data-key="'+key+'" autocomplete="off" spellcheck="false" placeholder="correct word(s)"></span>';
    } else if(ex.type==='listen'){
      s+='<button class="play-btn" data-key="'+key+'" data-text="'+esc(it.text)+'" title="Listen">▶</button>';
      s+='<span class="qtext">'+esc(it.display).replace('___','<input class="gap" data-key="'+key+'" autocomplete="off" spellcheck="false" style="min-width:110px">')+'</span>';
    }
    s+='<span class="feedback" id="fb-'+key+'"></span>';
    s+='<button class="show-a" data-key="'+key+'">Show answer</button>';
    s+='</div>';
    return s;
  }

  // ---------- interactions ----------
  // MCQ select
  root.addEventListener('click',function(e){
    var opt=e.target.closest('.opt');
    if(opt){
      var box=opt.parentNode; box.querySelectorAll('.opt').forEach(function(o){o.classList.remove('sel');});
      opt.classList.add('sel'); box.dataset.sel=opt.dataset.oi; return;
    }
    var w=e.target.closest('.ord-bank .word');
    if(w){ var k=w.parentNode.dataset.key; root.querySelector('.ord-build[data-key="'+k+'"]').appendChild(w); return; }
    var bw=e.target.closest('.ord-build .word');
    if(bw){ var k2=bw.parentNode.dataset.key; root.querySelector('.ord-bank[data-key="'+k2+'"]').appendChild(bw); return; }
    var pb=e.target.closest('.play-btn');
    if(pb){ speak(pb); return; }
    var sa=e.target.closest('.show-a');
    if(sa){ showAnswer(sa.dataset.key); return; }
    var cb=e.target.closest('.btn-check');
    if(cb){ checkEx(cb.dataset.ex); return; }
    var nx=e.target.closest('.nav-next');
    if(nx){ gotoNext(nx.dataset.next); return; }
    var tb=e.target.closest('.tab');
    if(tb){ activate(tb.dataset.tab); return; }
    var rs=e.target.closest('.btn-reset');
    if(rs){ resetAll(); return; }
  });

  // ---------- speech ----------
  function speak(btn){
    var t=btn.dataset.text;
    if(!('speechSynthesis' in window)){ alert('Your browser does not support audio playback. Please read the sentence below.'); return; }
    window.speechSynthesis.cancel();
    var u=new SpeechSynthesisUtterance(t);
    u.lang='en-GB'; u.rate=0.85;
    var voices=window.speechSynthesis.getVoices();
    var gb=voices.filter(function(v){return /en-GB/i.test(v.lang);});
    if(gb.length) u.voice=gb[0];
    btn.classList.add('playing'); btn.textContent='♪';
    u.onend=function(){ btn.classList.remove('playing'); btn.textContent='▶'; };
    u.onerror=function(){ btn.classList.remove('playing'); btn.textContent='▶'; };
    window.speechSynthesis.speak(u);
  }
  if('speechSynthesis' in window){ window.speechSynthesis.getVoices(); window.speechSynthesis.onvoiceschanged=function(){}; }

  // ---------- find item + answers ----------
  function getItem(key){
    var parts=key.split('-'); var exid=parts[0]; var idx=parseInt(parts[1],10);
    var ex=DATA.exercises.filter(function(e){return e.id===exid;})[0];
    return {ex:ex, it:ex.items[idx]};
  }
  function answersOf(ex,it){
    if(ex.type==='mcq') return [it.opts[it.correct]];
    if(ex.type==='order') return [it.answer];
    if(ex.type==='spell') return [it.answer];
    return it.answers;
  }

  // ---------- check single ----------
  function evalItem(key){
    var g=getItem(key), ex=g.ex, it=g.it, fb=root.querySelector('#fb-'+key);
    var correct=false, given='';
    if(ex.type==='mcq'){
      var box=root.querySelector('.mcq-opts[data-key="'+key+'"]');
      var sel=box.dataset.sel;
      box.querySelectorAll('.opt').forEach(function(o){o.classList.remove('ok','no');});
      if(sel!=null && sel!==''){
        given=it.opts[+sel];
        correct=(+sel===it.correct);
        box.querySelectorAll('.opt')[it.correct].classList.add('ok');
        if(!correct) box.querySelectorAll('.opt')[+sel].classList.add('no');
      } else { box.querySelectorAll('.opt')[it.correct].classList.add('ok'); }
    } else if(ex.type==='order'){
      var build=root.querySelector('.ord-build[data-key="'+key+'"]');
      var words=[].map.call(build.querySelectorAll('.word'),function(w){return w.dataset.w;});
      given=words.join(' ');
      correct=match(given,[it.answer]);
      build.classList.remove('ok','no'); build.classList.add(correct?'ok':'no');
    } else {
      var inp=root.querySelector('input.gap[data-key="'+key+'"]');
      given=inp.value;
      correct=match(given,answersOf(ex,it));
      inp.classList.remove('ok','no'); inp.classList.add(correct?'ok':'no');
    }
    var qn=root.querySelector('.item[data-key="'+key+'"] .qn');
    if(qn){ qn.classList.remove('ok','no','shown'); qn.classList.add(correct?'ok':'no'); }
    if(state[key]==='shown'){ /* keep shown */ }
    else state[key]=correct?'ok':'no';
    if(fb){
      if(correct) fb.innerHTML='<span class="mark-ok">✓ Correct</span>';
      else if(given!=='') fb.innerHTML='<span class="mark-no">✗ Try again</span>';
      else fb.innerHTML='<span class="mark-no">— no answer</span>';
    }
    return correct;
  }

  function checkEx(exid){
    var ex=DATA.exercises.filter(function(e){return e.id===exid;})[0];
    var ok=0;
    ex.items.forEach(function(it,idx){ if(evalItem(exid+'-'+idx)) ok++; });
    var sc=root.querySelector('#score-'+exid);
    sc.innerHTML='Score: <b>'+ok+' / '+ex.items.length+'</b>';
    updateProgress();
  }

  function showAnswer(key){
    var g=getItem(key), ex=g.ex, it=g.it, fb=root.querySelector('#fb-'+key);
    var ans=answersOf(ex,it)[0];
    if(ex.type==='mcq'){
      var box=root.querySelector('.mcq-opts[data-key="'+key+'"]');
      box.querySelectorAll('.opt').forEach(function(o){o.classList.remove('ok','no','sel');});
      box.querySelectorAll('.opt')[it.correct].classList.add('ok');
    } else if(ex.type==='order'){
      var build=root.querySelector('.ord-build[data-key="'+key+'"]');
      var bank=root.querySelector('.ord-bank[data-key="'+key+'"]');
      [].slice.call(build.querySelectorAll('.word')).forEach(function(w){bank.appendChild(w);});
      build.classList.remove('no'); build.classList.add('ok');
    } else {
      var inp=root.querySelector('input.gap[data-key="'+key+'"]');
      inp.value=ans; inp.classList.remove('no'); inp.classList.add('ok');
    }
    if(fb) fb.innerHTML='<span class="corr">Answer: '+esc(ans)+'</span>';
    if(state[key]!=='ok') state[key]='shown';
    var qn2=root.querySelector('.item[data-key="'+key+'"] .qn');
    if(qn2 && !qn2.classList.contains('ok')){ qn2.classList.remove('no'); qn2.classList.add('shown'); }

    updateProgress();
  }

  // ---------- progress ----------
  function updateProgress(){
    var done=0; for(var k in state){ if(state[k]==='ok') done++; }
    var pct=Math.round(done/TOTAL*100);
    var circ=root.querySelector('#ring-fg');
    var C=2*Math.PI*33;
    circ.style.strokeDasharray=C;
    circ.style.strokeDashoffset=C*(1-done/TOTAL);
    root.querySelector('#ring-pct').textContent=pct+'%';
    var cel=root.querySelector('#u1-celebrate'); if(cel) cel.classList.toggle('show', done>=TOTAL);
  }

  // ---------- tabs ----------
  function activate(id){
    root.querySelectorAll('.tab').forEach(function(t){t.classList.toggle('active',t.dataset.tab===id);});
    root.querySelectorAll('.panel').forEach(function(p){p.classList.toggle('active',p.id==='panel-'+id);});
    var sc=root.querySelector('.ws-head'); if(sc && sc.scrollIntoView) sc.scrollIntoView({behavior:'smooth',block:'start'});
  }
  function gotoNext(cur){
    var ids=['notes'].concat(DATA.exercises.map(function(e){return e.id;}));
    var i=ids.indexOf(cur); if(i>=0 && i<ids.length-1) activate(ids[i+1]);
  }

  function resetAll(){
    state={};
    root.querySelectorAll('input.gap').forEach(function(i){i.value='';i.classList.remove('ok','no');});
    root.querySelectorAll('.opt').forEach(function(o){o.classList.remove('ok','no','sel');});
    root.querySelectorAll('.mcq-opts').forEach(function(b){delete b.dataset.sel;});
    root.querySelectorAll('.feedback').forEach(function(f){f.innerHTML='';});
    root.querySelectorAll('.ex-score').forEach(function(s){s.innerHTML='';});
    root.querySelectorAll('.qn').forEach(function(q){q.classList.remove('ok','no','shown');});
    root.querySelectorAll('.ord-build').forEach(function(b){
      var bank=root.querySelector('.ord-bank[data-key="'+b.dataset.key+'"]');
      [].slice.call(b.querySelectorAll('.word')).forEach(function(w){bank.appendChild(w);});
      b.classList.remove('ok','no');
    });
    updateProgress();
  }

  updateProgress();
  activate('notes');
})();
\"))));<\/script>","protected":false},"excerpt":{"rendered":"<p>English Grammar in Use \u00b7 Murphy Intermediate Grammar Master English grammar one unit at a time. Clear notes, then 40+ interactive exercises with instant feedback \u2014 based on the topics in English Grammar in Use (Intermediate). UNIT 1 Present continuous \u25cf LIVE \u2192 UNIT 2 Present simple \u25cf LIVE \u2192 UNIT 3 Continuous or simple? [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-with-title","meta":{"footnotes":""},"class_list":["post-2962","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages\/2962","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/comments?post=2962"}],"version-history":[{"count":1,"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages\/2962\/revisions"}],"predecessor-version":[{"id":3012,"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages\/2962\/revisions\/3012"}],"wp:attachment":[{"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/media?parent=2962"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}