{"id":4595,"date":"2026-06-24T00:51:40","date_gmt":"2026-06-24T00:51:40","guid":{"rendered":"https:\/\/allenglish4u.com\/grammar-intermediate-unit-31\/"},"modified":"2026-06-24T00:51:40","modified_gmt":"2026-06-24T00:51:40","slug":"grammar-intermediate-unit-31","status":"publish","type":"page","link":"https:\/\/allenglish4u.com\/vi\/grammar-intermediate-unit-31\/","title":{"rendered":"Have to and must \u2014 English Grammar in Use (Unit 31)"},"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\" 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><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-13\/\"><div class=\"un\">UNIT 13<\/div><div class=\"ut\">Perfect vs past 1<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-14\/\"><div class=\"un\">UNIT 14<\/div><div class=\"ut\">Perfect vs past 2<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-15\/\"><div class=\"un\">UNIT 15<\/div><div class=\"ut\">Past perfect<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-16\/\"><div class=\"un\">UNIT 16<\/div><div class=\"ut\">Past perfect cont.<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-17\/\"><div class=\"un\">UNIT 17<\/div><div class=\"ut\">Have &#038; have got<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-18\/\"><div class=\"un\">UNIT 18<\/div><div class=\"ut\">Used to (do)<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-19\/\"><div class=\"un\">UNIT 19<\/div><div class=\"ut\">Future: present tenses<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-20\/\"><div class=\"un\">UNIT 20<\/div><div class=\"ut\">Future: going to<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-21\/\"><div class=\"un\">UNIT 21<\/div><div class=\"ut\">Future: will\/shall<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-22\/\"><div class=\"un\">UNIT 22<\/div><div class=\"ut\">Future: will\/shall 2<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-23\/\"><div class=\"un\">UNIT 23<\/div><div class=\"ut\">Future: will \/ going to<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-24\/\"><div class=\"un\">UNIT 24<\/div><div class=\"ut\">Future cont. &#038; perfect<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-25\/\"><div class=\"un\">UNIT 25<\/div><div class=\"ut\">When &#038; if<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-26\/\"><div class=\"un\">UNIT 26<\/div><div class=\"ut\">Can\/could\/able to<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-27\/\"><div class=\"un\">UNIT 27<\/div><div class=\"ut\">Could \/ could have<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-28\/\"><div class=\"un\">UNIT 28<\/div><div class=\"ut\">Must \/ can&#8217;t<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-29\/\"><div class=\"un\">UNIT 29<\/div><div class=\"ut\">May and might 1<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip\" href=\"\/vi\/grammar-intermediate-unit-30\/\"><div class=\"un\">UNIT 30<\/div><div class=\"ut\">May and might 2<\/div><div class=\"st live2\">\u25cf LIVE \u2192<\/div><\/a><a class=\"unit-chip live\" href=\"#u1-worksheet\"><div class=\"un\">UNIT 31<\/div><div class=\"ut\">Have to and must<\/div><div class=\"st\">\u25cf You&#8217;re here<\/div><\/a><\/div><\/div><div id=\"u1-worksheet\"><\/div><div class=\"ws-head\"><div style=\"flex:1 1 260px\"><span class=\"ws-badge\">UNIT 31 \u00b7 Intermediate \u00b7 B1\u2013B2<\/span><h1 class=\"serif\">Have to and must<small>&#8220;have to \u00b7 must \u00b7 mustn&#8217;t \u00b7 don&#8217;t have to&#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\">\ud83d\udca1 \u2014 Ex 1<span class=\"badge\">8<\/span><\/button><button class=\"tab\" data-tab=\"ex2\">\ud83e\udde9 \u2014 Ex 2<span class=\"badge\">10<\/span><\/button><button class=\"tab\" data-tab=\"ex3\">\ud83d\udd18 \u2014 Ex 3<span class=\"badge\">8<\/span><\/button><button class=\"tab\" data-tab=\"ex4\">\ud83d\udd00 \u2014 Ex 4<span class=\"badge\">6<\/span><\/button><button class=\"tab\" data-tab=\"ex5\">\ud83d\udee0\ufe0f \u2014 Ex 5<span class=\"badge\">6<\/span><\/button><button class=\"tab\" data-tab=\"ex6\">\ud83c\udfa7 \u2014 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 31!<\/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 Have to and must<\/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\">\ud83d\udca1<\/span><div><b>What you&#8217;ll learn<\/b><span>have to \u00b7 must \u00b7 mustn&#8217;t \u00b7 don&#8217;t have to<\/span><\/div><\/div>\n  <div class=\"ls-item\"><span class=\"ls-ic\">\ud83d\udd70\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> <em class=\"hl\">have to<\/em> \u2014 external obligation<\/h3>\n  <div class=\"formula\">\n    <span class=\"fb-subj\">I \/ You \/ We \/ They<\/span>\n    <span class=\"fb-aux\">have to<\/span>\n    <span class=\"fb-verb\">leave by 8.<\/span>\n  <\/div>\n  <div class=\"formula\" style=\"margin-top:6px\">\n    <span class=\"fb-subj\">He \/ She \/ It<\/span>\n    <span class=\"fb-aux\">has to<\/span>\n    <span class=\"fb-verb\">wear a uniform.<\/span>\n  <\/div>\n  <p class=\"instr\" style=\"margin-top:4px\">Use <b>have to<\/b> when the obligation comes from <b>outside<\/b> \u2014 a rule, a law, a boss, a schedule, or circumstances. The speaker is not personally imposing the rule.<\/p>\n  <table class=\"form-table\">\n    <tr><td><b>rule \/ law<\/b><\/td><td>All drivers <b>have to<\/b> wear a seatbelt \u2014 it&#8217;s the law.<\/td><\/tr>\n    <tr><td><b>circumstance<\/b><\/td><td>The lift is broken, so we <b>have to<\/b> take the stairs.<\/td><\/tr>\n    <tr><td><b>job requirement<\/b><\/td><td>She <b>has to<\/b> attend the weekly team meeting.<\/td><\/tr>\n  <\/table>\n  <div class=\"sv-grid\">\n    <div class=\"sv ok\"><span class=\"sv-b\">questions<\/span> Do you <b>have to<\/b> work on Saturdays? \u00b7 Does he <b>have to<\/b> wear a tie?<\/div>\n    <div class=\"sv ok\"><span class=\"sv-b\">negatives<\/span> I <b>don&#8217;t have to<\/b> wear a uniform. \u00b7 She <b>doesn&#8217;t have to<\/b> be there until noon.<\/div>\n  <\/div>\n<\/div>\n\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">B<\/span> <em class=\"hl\">must<\/em> \u2014 personal obligation \/ strong recommendation<\/h3>\n  <div class=\"formula\">\n    <span class=\"fb-subj\">I<\/span>\n    <span class=\"fb-aux\">must<\/span>\n    <span class=\"fb-verb\">remember to call her.<\/span>\n  <\/div>\n  <p class=\"instr\" style=\"margin-top:4px\">Use <b>must<\/b> when <b>you<\/b> feel the obligation \u2014 a personal decision, a strong recommendation, or an inner voice. It expresses the speaker&#8217;s own authority or strong feeling.<\/p>\n  <div class=\"use-grid\">\n    <div class=\"use-card\"><b>personal reminder<\/b><span>&#8216;I <b>must<\/b> buy a birthday card on my way home,&#8217; he thought.<\/span><\/div>\n    <div class=\"use-card\"><b>strong advice<\/b><span>You <b>must<\/b> try this restaurant \u2014 the food is amazing!<\/span><\/div>\n    <div class=\"use-card\"><b>official notice<\/b><span>All passengers <b>must<\/b> present their boarding pass at the gate.<\/span><\/div>\n  <\/div>\n  <p class=\"tip\">\ud83d\udca1 In everyday speech, <b>have to<\/b> and <b>must<\/b> are often interchangeable for obligation \u2014 but <b>must<\/b> sounds more personal or urgent.<\/p>\n<\/div>\n\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">C<\/span> <em class=\"hl\">mustn&#8217;t<\/em> vs <em class=\"hl\">don&#8217;t have to<\/em><\/h3>\n  <p class=\"instr\" style=\"margin-top:0\">These two look similar but mean very different things:<\/p>\n  <table class=\"form-table\">\n    <tr>\n      <td><b>mustn&#8217;t<\/b><\/td>\n      <td><b>Prohibition<\/b> \u2014 it is <em>not allowed<\/em>.<\/td>\n      <td>You <b>mustn&#8217;t<\/b> smoke here. (= it is forbidden)<\/td>\n    <\/tr>\n    <tr>\n      <td><b>don&#8217;t have to<\/b><\/td>\n      <td><b>No obligation<\/b> \u2014 it is <em>not necessary<\/em>, but you can if you want.<\/td>\n      <td>You <b>don&#8217;t have to<\/b> wear a tie. (= it&#8217;s optional)<\/td>\n    <\/tr>\n  <\/table>\n  <div class=\"sv-grid\">\n    <div class=\"sv no\"><span class=\"sv-b\">common error<\/span> &#8216;You <b>mustn&#8217;t<\/b> come if you don&#8217;t want to.&#8217; \u2717 <em>(sounds like a ban, but the speaker means it&#8217;s optional)<\/em><\/div>\n    <div class=\"sv ok\"><span class=\"sv-b\">correct<\/span> &#8216;You <b>don&#8217;t have to<\/b> come if you don&#8217;t want to.&#8217; \u2713<\/div>\n  <\/div>\n<\/div>\n\n<div class=\"note-block\">\n  <h3><span class=\"note-tag\">D<\/span> Past &amp; future forms<\/h3>\n  <p class=\"instr\" style=\"margin-top:0\"><b>must<\/b> has no past or future tense. Use <b>have to<\/b> for those forms:<\/p>\n  <table class=\"form-table\">\n    <tr><td><b>past<\/b><\/td><td><b>had to<\/b><\/td><td>We <b>had to<\/b> wait an hour \u2014 the train was delayed.<\/td><\/tr>\n    <tr><td><b>future<\/b><\/td><td><b>will have to<\/b><\/td><td>You <b>will have to<\/b> register online from next month.<\/td><\/tr>\n    <tr><td><b>after modal<\/b><\/td><td><b>have to<\/b><\/td><td>You might <b>have to<\/b> pay a deposit. \u00b7 You should <b>have to<\/b>\u2026 \u2717<\/td><\/tr>\n    <tr><td><b>present perfect<\/b><\/td><td><b>have had to<\/b><\/td><td>She <b>has had to<\/b> cancel twice already.<\/td><\/tr>\n  <\/table>\n  <div class=\"chips\">\n    <span class=\"chip\">external rule \u2192 have to<\/span>\n    <span class=\"chip\">personal feeling \u2192 must<\/span>\n    <span class=\"chip\">forbidden \u2192 mustn&#8217;t<\/span>\n    <span class=\"chip\">not necessary \u2192 don&#8217;t have to<\/span>\n    <span class=\"chip\">past obligation \u2192 had to<\/span>\n  <\/div>\n<\/div>\n\n<div class=\"remember\"><span class=\"rm-ic\">\ud83d\udccc<\/span>\n  <div><b>Remember<\/b> \u2014 <span class=\"rm-tag pos\">have to = external rule or circumstance \u00b7 must = personal decision or strong advice \u00b7 mustn&#8217;t = forbidden (NOT allowed) \u00b7 don&#8217;t have to = not necessary (optional) \u00b7 <b>must has no past<\/b> \u2014 use <b>had to<\/b> for past obligation \u00b7 never say <em>musted<\/em> or <em>didn&#8217;t must<\/em><\/span>. Quick check: &#8216;You <b>mustn&#8217;t<\/b> go.&#8217; (= it&#8217;s forbidden) vs &#8216;You <b>don&#8217;t have to<\/b> go.&#8217; (= it&#8217;s your choice).<\/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(\"{"unit": {"num": 31, "title": "Have to and must", "form": "have to \u00b7 must \u00b7 mustn't \u00b7 don't have to", "level": "Intermediate \u00b7 B1\u2013B2", "total": 44}, "exercises": [{"id": "ex1", "type": "spell", "icon": "\ud83d\udca1", "title": "Exercise 1 \u2014 have, has, had, or must?", "instr": "Fill in the blank with exactly one word: <b>have</b>, <b>has</b>, <b>had</b>, or <b>must</b>.", "items": [{"base": "She ___ to be at the airport by 7 a.m.", "answer": "has"}, {"base": "I ___ to stay late at work yesterday \u2014 the report wasn't finished.", "answer": "had"}, {"base": "You ___ be joking \u2014 that price is incredible!", "answer": "must"}, {"base": "Do you ___ to wear a uniform at your school?", "answer": "have"}, {"base": "He ___ to see a doctor because his knee was swollen.", "answer": "had"}, {"base": "We ___ submit the application before noon \u2014 no extensions.", "answer": "must"}, {"base": "Every visitor ___ to sign in at the reception desk.", "answer": "has"}, {"base": "I really ___ organise my desk \u2014 it's impossible to find anything.", "answer": "must"}]}, {"id": "ex2", "type": "gap", "icon": "\ud83e\udde9", "title": "Exercise 2 \u2014 Complete with the correct form", "instr": "Fill the gap using the cue in brackets. 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