Bac English: Modal Verbs (Can, Could, May, Might, Must, Should, Will, Would) – Grammar Guide and Bac Practice – 3rd Year Secondary School (Bac) – المنهاج الجزائري

📖 Lesson Objectives

• Understand the meaning and use of English modal verbs
• Differentiate between modals of ability, permission, obligation, and advice
• Use modal verbs correctly in Bac exam contexts
• Practice with exam-style exercises

📝 What are Modal Verbs?

Modal verbs (also called modals) are auxiliary verbs that express ability, possibility, permission, obligation, necessity, or advice. They are always followed by the base form of the main verb (without “to”).

Key features:

• They do not take “-s” in the third person singular (He can — NOT He cans)
• They form questions by inversion (Can I? — NOT Do I can?)
• They form negatives by adding “not” (cannot, must not, should not)
• They do not have infinitives or participles

📚 Complete Modal Verb Guide

Modal	Meaning	Example	Bac Context
Can	Ability (present), Permission (informal), Possibility	I can speak English.	Writing: expressing ability
Could	Ability (past), Polite request, Possibility	Could you help me?	Letters: polite requests
May	Permission (formal), Possibility	May I come in?	Formal writing
Might	Weak possibility	It might rain.	Making predictions
Must	Strong obligation, Necessity, Logical conclusion	You must study. / He must be the teacher.	Rules, certainty
Must not	Prohibition (strong)	You must not smoke here.	Rules, regulations
Should	Advice, Recommendation	You should eat healthily.	Giving advice in essays
Will	Future, Promise, Prediction	I will help you.	Future plans
Would	Polite request, Preference, Habit in past	Would you like tea? / When I was young, I would visit…	Writing about past habits

🔄 Modal Perfect (Modals + have + past participle)

Used to talk about the past:

Structure	Meaning	Example
Must have + pp	Strong certainty about the past	He must have forgotten.
May/Might have + pp	Possibility in the past	She might have left.
Could have + pp	Past ability not used	I could have won.
Should have + pp	Past advice not followed (regret)	You should have studied.
Would have + pp	Hypothetical past (3rd conditional)	I would have come if I had known.

✍️ Bac Practice Exercises

Exercise 1: Choose the correct modal.

1. You (must / can) respect your parents. (obligation)
2. He (could / must) speak three languages when he was 10. (past ability)
3. We (should / might) visit the museum tomorrow if we have time. (possibility)
4. Students (must not / should not) cheat in exams. (prohibition)

Answers: 1. must 2. could 3. might 4. must not

Exercise 2: Bac-style rewriting.

“It is necessary for all citizens to respect the law.” → All citizens must respect the law.

“Perhaps the government will reduce taxes next year.” → The government may/might reduce taxes next year.

“It wasn’t necessary for me to attend the meeting.” → I didn’t have to attend the meeting.

“I am sure he is the director. He behaves like one.” → He must be the director.

Exercise 3: Rewrite using modal perfect.

1. I didn’t call you. (past regret) → I should have called you.
2. Perhaps he didn’t receive my message. → He might not have received my message.
3. It was possible for them to win, but they didn’t. → They could have won.

📍 Similar Lessons

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