{"id":2642,"date":"2026-06-13T10:13:40","date_gmt":"2026-06-13T10:13:40","guid":{"rendered":"https:\/\/allenglish4u.com\/grammar-intermediate-unit-2\/"},"modified":"2026-06-13T18:52:53","modified_gmt":"2026-06-13T18:52:53","slug":"grammar-intermediate-unit-2","status":"publish","type":"page","link":"https:\/\/allenglish4u.com\/vi\/grammar-intermediate-unit-2\/","title":{"rendered":"Present Simple \u2014 English Grammar in Use (Unit 2)"},"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) ---- *\/\n.ae4u-u1 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.signal-row>b{font-size:14px;color:#27433a;white-space:nowrap;}\n\/* spell highlight *\/\n.ae4u-u1 .spell-table .rule{display:inline-block;font-size:11.5px;font-weight:800;color:#fff;background:var(--g1);border-radius:20px;padding:1px 9px;margin-left:6px;vertical-align:middle;}\n.ae4u-u1 .spell-table em.hl{font-style:normal;font-weight:800;color:#fff;background:var(--amber);border-radius:4px;padding:0 3px;}\n.ae4u-u1 .spell-table em.cut{font-style:normal;color:var(--bad);text-decoration:line-through;}\n.ae4u-u1 .spell-table td:last-child{font-size:15px;}\n\/* state-verb grid *\/\n.ae4u-u1 .sv-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0;}\n.ae4u-u1 .sv{display:flex;align-items:center;gap:9px;border-radius:10px;padding:9px 12px;font-size:14.5px;}\n.ae4u-u1 .sv.ok{background:#E9F8F1;}\n.ae4u-u1 .sv.no{background:#FCEBEE;color:#94516a;}\n.ae4u-u1 .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 live\" href=\"#u1-worksheet\"><div class=\"un\">UNIT 2<\/div><div class=\"ut\">Present simple<\/div><div class=\"st\">\u25cf You&#8217;re here<\/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\" href=\"\/vi\/grammar-intermediate-unit-9\/\"><div class=\"un\">UNIT 9<\/div><div class=\"ut\">Present perfect cont.<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/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 2 \u00b7 Intermediate \u00b7 B1\u2013B2<\/span><h1 class=\"serif\">Present Simple<small>&#8220;I do&#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 2!<\/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 Simple<\/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>How &amp; when to use the present simple<\/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\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 \u00b7 you \u00b7 we \u00b7 they \/ he \u00b7 she \u00b7 it<\/span><\/div>\n    <span class=\"fb-op\">+<\/span>\n    <div class=\"fb fb-verb\"><span class=\"fb-lbl\">base verb (+ -s)<\/span><span class=\"fb-eg\">work \/ he works<\/span><\/div>\n  <\/div>\n  <div class=\"form-table\">\n    <div class=\"form-row\"><span class=\"form-pos\">+<\/span> I\/you\/we\/they <b>work<\/b> &nbsp;\u00b7&nbsp; he\/she\/it <b>works<\/b><\/div>\n    <div class=\"form-row\"><span class=\"form-neg\">\u2013<\/span> I\/you\/we\/they <b>don&#8217;t<\/b> work &nbsp;\u00b7&nbsp; he\/she\/it <b>doesn&#8217;t<\/b> work<\/div>\n    <div class=\"form-row\"><span class=\"form-q\">?<\/span> <b>Do<\/b> you work? &nbsp;\u00b7&nbsp; <b>Does<\/b> she work?<\/div>\n  <\/div>\n  <p class=\"tip\">\ud83d\udca1 After <b>do \/ does \/ doesn&#8217;t<\/b>, the main verb is the <b>base form<\/b> (no -s): <i>She doesn&#8217;t <u>work<\/u><\/i> \u2713 \u2014 not <s>doesn&#8217;t works<\/s>.<\/p>\n<\/div>\n\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">B<\/span> What it really means<\/h3>\n  <p>You use it for things that are <b>always true<\/b> or that <b>happen again and again<\/b> \u2014 not just at this moment.<\/p>\n  <div class=\"timeline\">\n    <svg viewbox=\"0 0 620 150\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Timeline: present simple \u2014 repeated, habitual actions across time\">\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      <g fill=\"#0E9F6E\">\n        <circle cx=\"90\" cy=\"100\" r=\"8\"\/><circle cx=\"190\" cy=\"100\" r=\"8\"\/><circle cx=\"290\" cy=\"100\" r=\"8\"\/>\n        <circle cx=\"390\" cy=\"100\" r=\"8\"\/><circle cx=\"490\" cy=\"100\" r=\"8\"\/>\n      <\/g>\n      <line x1=\"290\" y1=\"78\" x2=\"290\" y2=\"100\" stroke=\"#F59E0B\" stroke-width=\"3\"\/>\n      <text x=\"290\" y=\"70\" text-anchor=\"middle\" fill=\"#B4790B\" font-size=\"13\" font-weight=\"800\" font-family=\"Plus Jakarta Sans, sans-serif\">NOW<\/text>\n      <text x=\"60\" y=\"130\" fill=\"#5B7268\" font-size=\"13\" font-weight=\"700\" font-family=\"Plus Jakarta Sans, sans-serif\">PAST<\/text>\n      <text x=\"565\" y=\"130\" fill=\"#5B7268\" font-size=\"13\" font-weight=\"700\" font-family=\"Plus Jakarta Sans, sans-serif\">FUTURE<\/text>\n      <text x=\"310\" y=\"40\" text-anchor=\"middle\" fill=\"#0E9F6E\" font-size=\"13\" font-weight=\"700\" font-family=\"Plus Jakarta Sans, sans-serif\">repeated again and again \u2014 &#8220;every day&#8221;<\/text>\n    <\/svg>\n  <\/div>\n<\/div>\n\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">C<\/span> When we use it<\/h3>\n  <div class=\"use-grid\">\n    <div class=\"use-card\"><div class=\"use-ic\">\ud83d\udd01<\/div><div class=\"use-t\">Habits &amp; routines<\/div><p>Things you do regularly.<\/p><span class=\"use-eg\">&#8220;I get up at seven every day.&#8221;<\/span><\/div>\n    <div class=\"use-card\"><div class=\"use-ic\">\ud83c\udfe0<\/div><div class=\"use-t\">Permanent situations<\/div><p>True for a long time.<\/p><span class=\"use-eg\">&#8220;She lives in Madrid.&#8221;<\/span><\/div>\n    <div class=\"use-card\"><div class=\"use-ic\">\ud83c\udf0d<\/div><div class=\"use-t\">General truths &amp; facts<\/div><p>Always true.<\/p><span class=\"use-eg\">&#8220;Water boils at 100\u00b0C.&#8221;<\/span><\/div>\n    <div class=\"use-card\"><div class=\"use-ic\">\ud83d\udd52<\/div><div class=\"use-t\">Timetables<\/div><p>Fixed schedules (even future).<\/p><span class=\"use-eg\">&#8220;The train leaves at 9:30.&#8221;<\/span><\/div>\n  <\/div>\n  <div class=\"signal-row\"><b>Signal words:<\/b>\n    <div class=\"chips\"><span>always<\/span><span>usually<\/span><span>often<\/span><span>sometimes<\/span><span>rarely<\/span><span>never<\/span><span>every day<\/span><span>on Mondays<\/span><span>twice a week<\/span><\/div>\n  <\/div>\n<\/div>\n\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">D<\/span> Spelling of the he\/she\/it form<\/h3>\n  <table class=\"spell-table\">\n    <tr><td>most verbs <span class=\"rule\">+ s<\/span><\/td><td>work \u2192 work<em class=\"hl\">s<\/em> \u00b7 play \u2192 play<em class=\"hl\">s<\/em><\/td><\/tr>\n    <tr><td>after -s, -sh, -ch, -x, -o <span class=\"rule\">+ es<\/span><\/td><td>watch \u2192 watch<em class=\"hl\">es<\/em> \u00b7 go \u2192 go<em class=\"hl\">es<\/em> \u00b7 fix \u2192 fix<em class=\"hl\">es<\/em><\/td><\/tr>\n    <tr><td>consonant + y <span class=\"rule\">\u2192 -ies<\/span><\/td><td>stud<em class=\"cut\">y<\/em> \u2192 stud<em class=\"hl\">ies<\/em> \u00b7 carr<em class=\"cut\">y<\/em> \u2192 carr<em class=\"hl\">ies<\/em><\/td><\/tr>\n    <tr><td>vowel + y <span class=\"rule\">just + s<\/span><\/td><td>play \u2192 play<em class=\"hl\">s<\/em> \u00b7 buy \u2192 buy<em class=\"hl\">s<\/em><\/td><\/tr>\n    <tr><td>irregular<\/td><td>have \u2192 <em class=\"hl\">has<\/em><\/td><\/tr>\n  <\/table>\n<\/div>\n\n<div class=\"note-block warn\">\n  <h3><span class=\"note-tag\">E<\/span> Present simple vs continuous<\/h3>\n  <p>Use the <b>present simple<\/b> for routines and facts; use the <b>present continuous<\/b> (am\/is\/are + -ing) for what is happening <i>right now<\/i>. <span class=\"xref\">(more in Units 3\u20134)<\/span><\/p>\n  <div class=\"sv-grid\">\n    <div class=\"sv ok\"><span class=\"sv-b\">\u2713<\/span> I usually <b>walk<\/b> to work. <i>(routine)<\/i><\/div>\n    <div class=\"sv ok\"><span class=\"sv-b\">\u2713<\/span> Look! She <b>is running<\/b>. <i>(now)<\/i><\/div>\n    <div class=\"sv no\"><span class=\"sv-b\">\u2717<\/span> <s>I am walking to work every day.<\/s><\/div>\n    <div class=\"sv no\"><span class=\"sv-b\">\u2717<\/span> <s>Look! She runs.<\/s><\/div>\n  <\/div>\n<\/div>\n\n<div class=\"note-block\">\n  <div class=\"remember\">\n    <span class=\"rm-ic\">\ud83d\udccc<\/span>\n    <div><b>Remember<\/b> \u2014 present simple = <span class=\"rm-tag pos\">base verb (+ -s for he\/she\/it)<\/span> for habits, facts &amp; timetables. Questions\/negatives use <b>do \/ does<\/b> + base verb.<\/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 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  var root = document.querySelector('.ae4u-u1');
  if(!root || !DATA) return;
  var TOTAL = DATA.unit.total;
  var state = {};   // itemKey -> 'ok' | 'no' | 'shown'

  function norm(s){
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    return String(s).toLowerCase()
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  function esc(s){return String(s).replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");}

  // ---------- render panels ----------
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  DATA.exercises.forEach(function(ex){
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    p.className='panel'; p.id='panel-'+ex.id; p.dataset.ex=ex.id;
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      s+='</div>';
    } else if(ex.type==='fix'){
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    } else if(ex.type==='listen'){
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    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');
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    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){
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    u.onend=function(){ btn.classList.remove('playing'); btn.textContent='▶'; };
    u.onerror=function(){ btn.classList.remove('playing'); btn.textContent='▶'; };
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  }
  if('speechSynthesis' in window){ window.speechSynthesis.getVoices(); window.speechSynthesis.onvoiceschanged=function(){}; }

  // ---------- find item + answers ----------
  function getItem(key){
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    var ex=DATA.exercises.filter(function(e){return e.id===exid;})[0];
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    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'){
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      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+'"]');
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      correct=match(given,answersOf(ex,it));
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    if(state[key]==='shown'){ /* keep shown */ }
    else state[key]=correct?'ok':'no';
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      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;
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\"))));<\/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 You&#8217;re here 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-2642","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages\/2642","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=2642"}],"version-history":[{"count":5,"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages\/2642\/revisions"}],"predecessor-version":[{"id":3005,"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/pages\/2642\/revisions\/3005"}],"wp:attachment":[{"href":"https:\/\/allenglish4u.com\/vi\/wp-json\/wp\/v2\/media?parent=2642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}