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Modal Verbs (Can, Must, Should, May) — Grammar Rules and Exercises — English 3rd Year Middle School — Algerian Curriculum

Modal verbs are special auxiliary verbs that express ability, necessity, obligation, permission, or advice. They are very common in English and essential for everyday communication. This lesson covers the most important modal verbs for 3rd year middle school students.

Learning Objectives

  • To identify and understand the use of modal verbs (can, must, should, may).
  • To use modal verbs correctly in affirmative, negative and interrogative sentences.
  • To distinguish between different modal verbs based on meaning.
  • To apply modal verbs in real-life situations and dialogues.

Lesson Explanation

What are Modal Verbs?

Modal verbs are auxiliary verbs that modify the meaning of the main verb. They do not change form (no -s in the third person) and are followed by the base form of the verb (without to).

1. Can / Can’t (Ability and Permission):

  • Used for ability: I can swim. (أستطيع السباحة)
  • Used for permission: Can I go out? (هل يمكنني الخروج؟)
  • Negative: cannot (can’t) — She can’t speak Chinese.
  • Question: Can you help me? Yes, I can. / No, I can’t.

2. Must / Mustn’t (Obligation and Prohibition):

  • Used for strong obligation: You must wear a seatbelt. (يجب عليك)
  • Negative (mustn’t) expresses prohibition: You mustn’t smoke here. (ممنوع)
  • Question: Must I finish this today? Yes, you must. / No, you needn’t.

3. Should / Shouldn’t (Advice and Recommendation):

  • Used for giving advice: You should drink more water. (ينبغي أن)
  • Negative: You shouldn’t eat too much sugar.
  • Question: Should I call the doctor?

4. May (Permission and Possibility):

  • Used for formal permission: May I come in? (هل يُسمح لي؟)
  • Used for possibility: It may rain tomorrow. (ربما)
  • Negative: may not — He may not come to the party.

Structure Table

Modal Use Example Translation
Can Ability / Permission I can run fast. أستطيع الركض بسرعة
Must Obligation You must study. يجب أن تدرس
Should Advice You should rest. ينبغي أن تستريح
May Possibility / Permission It may rain. ربما تمطر

Solved Examples

Example 1: Choose the correct modal

Fill in: “You _______ brush your teeth before bed.” (must/should/can)
Answer: should (advice) or must (obligation) — both are possible. “You should brush your teeth before bed.”

Example 2: Complete the sentence

She is very talented. She _______ play three musical instruments.
Answer: can (ability)

Practice Exercises

  1. Complete with can, must, should, or may: a) You _______ respect your parents. b) _______ I open the window? c) She _______ speak French and Arabic. d) You _______ eat too much junk food.
  2. Rewrite the sentences in the negative form: a) You can go out. b) He must finish his homework. c) She should see a doctor.
  3. Ask questions using the modals: a) you / swim? b) I / use your phone? c) we / leave now?
  4. Correct the mistakes: a) He can to play football. b) You musts study hard. c) She shoulds helps her mother.

Homework

Write 5 sentences about rules in your school using “must” and “mustn’t”. Then write 5 sentences giving advice to a new student using “should” and “shouldn’t”. Finally, write 3 things you can do and 2 things you may do at home.

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