{"id":273540,"date":"2026-09-24T03:00:28","date_gmt":"2026-09-24T08:00:28","guid":{"rendered":"https:\/\/langcom.org\/?p=273540"},"modified":"2026-09-24T03:00:28","modified_gmt":"2026-09-24T08:00:28","slug":"modal-verb-must-mustnt-a1-a1","status":"publish","type":"post","link":"https:\/\/langcom.org\/zh\/blog\/modal-verb-must-mustnt-a1-a1\/","title":{"rendered":"Learn Must and Mustn&#8217;t: Expressing Rules and Importance (A1 English Grammar)"},"content":{"rendered":"<div class=\"lc-answer\"><strong>\u6211\u4eec\u4f7f\u7528 <span data-no-translation>must<\/span> to talk about things that are very important or necessary to do.<\/strong> It&#8217;s like saying &#8216;you have to do this&#8217; or &#8216;it is a rule&#8217;. For example, <span data-no-translation>You must listen to your teacher.<\/span> This means it is a very important rule, and you have no choice. We also use <span data-no-translation>must<\/span> for strong advice or when we are sure about something. For things that are not allowed or are forbidden, we use <span data-no-translation>mustn&#8217;t<\/span> (which is short for <span data-no-translation>must not<\/span>). It means &#8216;you cannot do this&#8217; or &#8216;it is against the rules&#8217;. For instance, <span data-no-translation>You mustn&#8217;t touch the fire.<\/span> This is a rule that says touching fire is dangerous and not allowed. Remember, <span data-no-translation>must<\/span> \u548c <span data-no-translation>mustn&#8217;t<\/span> are modal verbs. They do not change form for different subjects (like <span data-no-translation>I must<\/span>, <span data-no-translation>he must<\/span>, <span data-no-translation>they must<\/span>), and we always use the base form of the main verb after them.<\/div>\n<h2>What is &#8216;must&#8217; for?<\/h2>\n<p>\u6211\u4eec\u4f7f\u7528 <span data-no-translation>must<\/span> to talk about things that are very important. It shows a strong obligation or a rule.<\/p>\n<ul>\n<li><strong>Obligation or Necessity:<\/strong> When something is necessary to do. For example, <span data-no-translation>Students must wear a uniform.<\/span><\/li>\n<li><strong>Strong Advice:<\/strong> When you think something is a very good idea. For example, <span data-no-translation>You must visit the museum; it&#8217;s amazing!<\/span><\/li>\n<\/ul>\n<div class=\"lc-cta lc-cta-blended\" style=\"border-radius:14px;padding:30px;margin:30px 0;text-align:center;color:#fff;background:linear-gradient(135deg,#0E63C4,#0A2540);\"><h3 style=\"color:#fff;font-size:22px;font-weight:800;margin:0 0 8px;\">\ud83c\udf93 \u91c7\u7528\u6df7\u5408\u5f0f\u6559\u5b66\u6cd5\u5b66\u4e60\u82f1\u8bed<\/h3><p style=\"margin:0 0 10px;opacity:.95;\">\u5c0f\u73ed\u6388\u8bfe \u00b7 7\u00d724\u5c0f\u65f6AI\u8f85\u5bfc \u00b7 \u5251\u6865\u8003\u8bd5\u5907\u8003<\/p><p style=\"margin:0 0 16px;font-size:18px;\">\u6765\u81ea <strong><span class=\"woocommerce-Price-amount amount\"><bdi><span class=\"woocommerce-Price-currencySymbol\" translate=\"no\" dir=\"auto\">$<\/span>39<\/bdi><\/span><\/strong> <s style=\"opacity:.6;\"><span class=\"woocommerce-Price-amount amount\"><bdi><span class=\"woocommerce-Price-currencySymbol\" translate=\"no\" dir=\"auto\">$<\/span>79<\/bdi><\/span><\/s> \u6bcf\u6708<\/p><a href=\"\/zh\/\" style=\"display:inline-block;margin-top:8px;padding:13px 30px;border-radius:8px;font-weight:700;text-decoration:none;background:#fff;color:#0E63C4;\">\u9884\u8ba2\u8bfe\u7a0b<\/a><\/div>\n<h2>What is 'mustn't' for?<\/h2>\n<p>\u6211\u4eec\u4f7f\u7528 <span data-no-translation>mustn't<\/span> \uff08\u6216 <span data-no-translation>must not<\/span>) to talk about things that are not allowed. It shows a prohibition.<\/p>\n<ul>\n<li><strong>Prohibition:<\/strong> When something is forbidden or against the rules. For example, <span data-no-translation>You mustn't take photos in the museum.<\/span><\/li>\n<li><strong>Danger:<\/strong> When something is dangerous to do. For example, <span data-no-translation>Children mustn't play with knives.<\/span><\/li>\n<\/ul>\n<h2>How do we form sentences with 'must' and 'mustn't'?<\/h2>\n<p><span data-no-translation>Must<\/span> \u548c <span data-no-translation>mustn't<\/span> are easy to use! They are modal verbs, so they follow simple rules.<\/p>\n<ul>\n<li><strong>Always use the base form of the verb:<\/strong> \u4e4b\u540e <span data-no-translation>must<\/span> \u6216 <span data-no-translation>mustn't<\/span>, the next verb is always in its basic form (e.g., <span data-no-translation>go<\/span>, <span data-no-translation>eat<\/span>, <span data-no-translation>study<\/span>).<\/li>\n<li><strong>No 'to':<\/strong> We do not use <span data-no-translation>to<\/span> \u4e4b\u540e <span data-no-translation>must<\/span> \u6216 <span data-no-translation>mustn't<\/span>.<\/li>\n<li><strong>No '-s' for 'he\/she\/it':<\/strong> <span data-no-translation>Must<\/span> never changes its form, even for <span data-no-translation>he<\/span>, <span data-no-translation>she<\/span>, \u6216 <span data-no-translation>it<\/span>.<\/li>\n<\/ul>\n<table>\n<caption>Forms of &lt;span data-no-translation&gt;Must&lt;\/span&gt; \u548c &lt;span data-no-translation&gt;Mustn&#039;t&lt;\/span&gt;<\/caption>\n<thead>\n<tr>\n<th>\u4e3b\u9898<\/th>\n<th>\u80af\u5b9a\u5f0f<\/th>\n<th>\u5426\u5b9a\u5f62\u5f0f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-no-translation>I \/ You \/ We \/ They<\/span><\/td>\n<td><span data-no-translation>must go<\/span><\/td>\n<td><span data-no-translation>mustn't go<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-no-translation>He \/ She \/ It<\/span><\/td>\n<td><span data-no-translation>must go<\/span><\/td>\n<td><span data-no-translation>mustn't go<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u793a\u4f8b<\/h2>\n<ul>\n<li><span data-no-translation>I must finish my homework before dinner.<\/span><\/li>\n<li><span data-no-translation>You must be quiet in the library.<\/span><\/li>\n<li><span data-no-translation>He must wear a helmet when he rides his bike.<\/span><\/li>\n<li><span data-no-translation>We mustn't talk during the exam.<\/span><\/li>\n<li><span data-no-translation>She mustn't forget her passport for the trip.<\/span><\/li>\n<li><span data-no-translation>They must arrive on time for the meeting.<\/span><\/li>\n<\/ul>\n<h2>\u7ec3\u4e60<\/h2>\n<div class=\"h5p-iframe-wrapper\"><iframe id=\"h5p-iframe-2260\" class=\"h5p-iframe\" data-content-id=\"2260\" style=\"height:1px\" src=\"about:blank\" frameborder=\"0\" scrolling=\"no\" title=\"PT04 L6 GRAMMAR must\"><\/iframe><\/div>\n<div class=\"lc-cta lc-cta-whatsapp\" style=\"border-radius:14px;padding:30px;margin:30px 0;text-align:center;color:#fff;background:linear-gradient(135deg,#3DB16A,#1f8a4c);\"><h3 style=\"color:#fff;font-size:22px;font-weight:800;margin:0 0 8px;\">\ud83d\udcac \u9700\u8981\u4e2a\u6027\u5316\u6307\u5bfc\u5417\uff1f<\/h3><p style=\"margin:0 0 16px;opacity:.95;\">\u4f5c\u4e3a\u5251\u6865\u5b98\u65b9\u5907\u8003\u4e2d\u5fc3\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a\u60a8\u63a8\u8350\u5408\u9002\u7684\u8bfe\u7a0b\u548c\u8ba4\u8bc1\u3002\u7acb\u5373\u4e0e\u6211\u4eec\u7684\u987e\u95ee\u5728\u7ebf\u54a8\u8be2\u3002.<\/p><a href=\"https:\/\/wa.me\/51987070865?text=Hi%2C%20I%27m%20interested%20in%20Langcom%27s%20courses%20and%20would%20like%20some%20guidance%20choosing%20the%20right%20one.\" style=\"display:inline-block;margin-top:8px;padding:13px 30px;border-radius:8px;font-weight:700;text-decoration:none;background:#fff;color:#1f8a4c;\">\u5728 WhatsApp \u4e0a\u4e0e\u987e\u95ee\u804a\u5929<\/a><\/div>\n<h2>\u897f\u73ed\u7259\u8bed\u6bcd\u8bed\u8005\u5e38\u72af\u7684\u9519\u8bef<\/h2>\n<p>Many Spanish speakers make small mistakes with <span data-no-translation>must<\/span> \u548c <span data-no-translation>mustn't<\/span>. Here are the most common ones to avoid:<\/p>\n<ul>\n<li><strong>Using 'to' after <span data-no-translation>must<\/span> \u6216 <span data-no-translation>mustn't<\/span>:<\/strong>\n<ul>\n<li>\u274c <span data-no-translation>You must to study.<\/span><\/li>\n<li>\u2705 <span data-no-translation>You must study.<\/span><\/li>\n<\/ul>\n<\/li>\n<li><strong>Adding '-s' to <span data-no-translation>must<\/span> for 'he', 'she', 'it':<\/strong>\n<ul>\n<li>\u274c <span data-no-translation>He musts go.<\/span><\/li>\n<li>\u2705 <span data-no-translation>He must go.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u5e38\u89c1\u95ee\u9898<\/h2>\n<h3>What is the main use of 'must'?<\/h3>\n<p><span data-no-translation>Must<\/span> is for strong rules, obligations, or things that are very important to do. For example, <span data-no-translation>You must listen to your parents.<\/span><\/p>\n<h3>What is the main use of 'mustn't'?<\/h3>\n<p><span data-no-translation>Mustn't<\/span> is for things that are not allowed or forbidden. For example, <span data-no-translation>You mustn't run in the corridors.<\/span><\/p>\n<h3>Can I say 'must not' instead of 'mustn't'?<\/h3>\n<p>\u662f\u7684\uff0c, <span data-no-translation>must not<\/span> \u662f\u5168\u79f0\uff0c\u800c <span data-no-translation>mustn't<\/span> is the short, common form. They mean the same thing.<\/p>\n<h3>Does 'must' change for 'he\/she\/it'?<\/h3>\n<p>\u4e0d\uff0c, <span data-no-translation>must<\/span> never changes its form. It is always <span data-no-translation>must<\/span> for all subjects (I, you, he, she, it, we, they).<\/p>\n<h2>\u76f8\u5173\u8bfe\u7a0b<\/h2>\n<ul>\n<li><a href=\"https:\/\/langcom.org\/zh\/?p=272776\">Modal verbs<\/a><\/li>\n<li><a href=\"https:\/\/langcom.org\/zh\/?p=273037\">Modal verbs<\/a><\/li>\n<li><a href=\"https:\/\/langcom.org\/zh\/?p=273133\">Modal verbs<\/a><\/li>\n<li><a href=\"https:\/\/langcom.org\/zh\/?p=273153\">Modal verbs<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>We use must to talk about things that are very important or necessary to do. It&#8217;s like saying &#8216;you have to do this&#8217; or &#8216;it is a rule&#8217;. For example, You must listen to your teacher. This means it is a very important rule, and you have no choice. We also use must for strong [&hellip;]<\/p>\n","protected":false},"author":192,"featured_media":274756,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"bwfblock_default_font":"","langcom_teaches":"Modal verbs","langcom_cefr":"A1","langcom_type":"grammar","langcom_faq":"[{\"q\": \"What is the main use of 'must'?\", \"a\": \"<span data-no-translation>Must<\/span> is for strong rules, obligations, or things that are very important to do. For example, <span data-no-translation>You must listen to your parents.<\/span>\"}, {\"q\": \"What is the main use of 'mustn't'?\", \"a\": \"<span data-no-translation>Mustn't<\/span> is for things that are not allowed or forbidden. For example, <span data-no-translation>You mustn't run in the corridors.<\/span>\"}, {\"q\": \"Can I say 'must not' instead of 'mustn't'?\", \"a\": \"Yes, <span data-no-translation>must not<\/span> is the full form, and <span data-no-translation>mustn't<\/span> is the short, common form. They mean the same thing.\"}, {\"q\": \"Does 'must' change for 'he\/she\/it'?\", \"a\": \"No, <span data-no-translation>must<\/span> never changes its form. It is always <span data-no-translation>must<\/span> for all subjects (I, you, he, she, it, we, they).\"}]","_kiss_seo_title":"","_kiss_seo_excerpt":"We use must to talk about things that are very important or necessary to do. It's like saying 'you have to do this' or 'it is a rule'.","_mwseo_canonical":"","_mwseo_keywords":"","_mwseo_primary_category":0,"footnotes":""},"categories":[608],"tags":[651,1228],"formats":[],"class_list":["post-273540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a1-beginner-english-for-kids","tag-grammar","tag-must"],"dsm_author":{"name":"\u52b3\u5c14","avatar_url":"https:\/\/langcom.org\/wp-content\/uploads\/nsl_avatars\/1de86ea706740d324aaef3dd8bf0843b.png","archive_link":"https:\/\/langcom.org\/zh\/blog\/author\/raulmaguinahamann\/","biodata":""},"dsm_categories":[{"term_name":"A1 Beginner English for Kids","term_id":608,"term_link":"https:\/\/langcom.org\/zh\/blog\/category\/learn-english\/english-for-kids\/a1-beginner-english-for-kids\/"}],"dsm_attachment_categories":[],"dsm_featured_image":{"thumbnail":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-150x150.webp","medium":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-300x158.webp","medium_large":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-768x403.webp","large":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-1024x538.webp","1536x1536":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1.webp","2048x2048":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1.webp","trp-custom-language-flag":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-18x9.webp","et-pb-post-main-image":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-400x250.webp","et-pb-post-main-image-fullwidth":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-1080x630.webp","et-pb-portfolio-image":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-400x284.webp","et-pb-portfolio-module-image":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-510x382.webp","et-pb-portfolio-image-single":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-1080x567.webp","et-pb-gallery-module-image-portrait":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-400x516.webp","et-pb-post-main-image-fullwidth-large":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1.webp","et-pb-image--responsive--desktop":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1.webp","et-pb-image--responsive--tablet":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-980x515.webp","et-pb-image--responsive--phone":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-480x252.webp","woocommerce_thumbnail":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-300x300.webp","woocommerce_single":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-600x315.webp","woocommerce_gallery_thumbnail":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1-100x100.webp","full":"https:\/\/langcom.org\/wp-content\/uploads\/2026\/07\/modal-verbs-a1-grammar-english-langcom-1.webp"},"dsm_comment_count":0,"_links":{"self":[{"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/posts\/273540","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/users\/192"}],"replies":[{"embeddable":true,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/comments?post=273540"}],"version-history":[{"count":0,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/posts\/273540\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/media\/274756"}],"wp:attachment":[{"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/media?parent=273540"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/categories?post=273540"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/tags?post=273540"},{"taxonomy":"post_format","embeddable":true,"href":"https:\/\/langcom.org\/zh\/wp-json\/wp\/v2\/formats?post=273540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}