مدونة التربية و التعليم في الجزائر – دروس، فروض، نتائج امتحانات مدونة التربية والتعليم في الجزائر | تحضير الدروس، فروض واختبارات، نتائج البكالوريا وBEM، مسابقات التوظيف، والتوجيه المدرسي للطلاب وأولياء الأمور.
Must and Mustn’t are modal verbs used in English to talk about obligation, necessity, and prohibition. Understanding how to use these modals correctly is essential for giving rules, expressing strong advice, and talking about things that are required or forbidden.
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Learning Objectives
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- Understand the difference between must and mustn’t
- Use must to express obligation and strong necessity
- Use mustn’t to express prohibition
- Form correct affirmative and negative sentences with must
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Must — Obligation and Necessity
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Must is used to say that something is necessary or very important to do. It expresses a strong obligation, often from the speaker’s own feeling or an external rule.
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Structure : Subject + must + base verb (without to)
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Examples :
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- You must wear a seatbelt in the car.
- Students must do their homework.
- I must study for the exam.
- We must arrive on time to school.
- He must drink plenty of water every day.
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Mustn’t — Prohibition
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Mustn’t (must not) is used to say that something is not allowed or forbidden. It expresses a strong prohibition.
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Structure : Subject + mustn’t + base verb (without to)
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Examples :
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- You mustn’t run in the corridors.
- We mustn’t use our phones in class.
- They mustn’t eat in the library.
- She mustn’t cross the street without looking.
- You mustn’t copy your friend’s homework.
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Difference between Must and Mustn’t
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- Must = it is necessary / required → You must do this.
- Mustn’t = it is forbidden / not allowed → You mustn’t do this.
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Note: Must vs. Have To
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Both must and have to express obligation. However, must is usually for internal obligation (the speaker’s feeling), while have to is for external rules. For 3rd Year Middle School, we focus on must and mustn’t.
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Solved Examples
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Example 1: Complete with must or mustn’t
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a) You _____ brush your teeth every day. → You must brush your teeth every day.
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b) You _____ play with matches. → You mustn’t play with matches.
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Example 2: School rules
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Write school rules using must or mustn’t:
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a) (be polite) → Students must be polite to teachers.
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b> (not chew gum) → Students mustn’t chew gum in class.
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Practice Exercises
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- Complete with must or mustn’t : You _____ listen to the teacher. You _____ be late for school. We _____ clean our classroom.
- Rewrite the sentences using must or mustn’t : It is necessary to do your homework. → _____. It is forbidden to eat in class. → _____.
- Match the sentence halves : You must / wear a uniform at school. You mustn’t / talk loudly in the library.
- Create two classroom rules using must and two using mustn’t.
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Homework Activity
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Write 5 rules for your school using must and mustn’t. For example: “Students must wear a uniform. Students mustn’t eat in the classroom.” Read your rules to the class tomorrow.
◆ دروس مشابهة
- Countable and Uncountable Nouns — Some, Any, Much, Many — English — 3rd Year Mid
- Present Continuous Tense (Verb + ing) — English — 3rd Year Middle School — Alger
