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.
Modal Auxiliaries (الأفعال الناقصة) – BAC English – 3rd Year Secondary School
Modal auxiliaries (also called modal verbs) are an essential grammar topic for the Baccalaureate English exam. They appear in multiple-choice questions, transformation exercises, and written expression tasks. This lesson covers all the modal verbs you need for the BAC exam with clear explanations, examples, and practice exercises.
📌 What are Modal Auxiliaries?
Modal auxiliaries are special verbs that express necessity, possibility, permission, ability, obligation, or advice. They are always followed by the base form of the main verb (without “to”).
Common Modals: can, could, may, might, must, should, ought to, shall, will, would, need, dare, had better.
Modal auxiliaries are special verbs that express necessity, possibility, permission, ability, obligation, or advice. They are always followed by the base form of the main verb (without “to”).
Common Modals: can, could, may, might, must, should, ought to, shall, will, would, need, dare, had better.
Lesson Objectives:
- Identify and understand the meaning of each modal verb
- Use modals correctly to express ability, permission, obligation, possibility, and advice
- Differentiate between modals with similar meanings (must vs have to, may vs might)
- Master modal perfects (modal + have + past participle)
- Practice with BAC-style exam exercises
1. Modals of Ability (القدرة)
| Modal | Use | Example |
|---|---|---|
| Can | Present ability (present/future) | I can speak English and Arabic. |
| Could | Past ability / Polite request | When I was young, I could run fast. / Could you help me? |
| Be able to | All tenses (replaces can/could) | She will be able to pass the BAC. / I haven’t been able to finish. |
Note: “Be able to” is more formal than “can” and can be used in all tenses (present, past, future, present perfect).
✅ BAC Examples:
• I can solve this math problem easily.
• She could read when she was four years old.
• After this course, you will be able to write essays in English.
• I can solve this math problem easily.
• She could read when she was four years old.
• After this course, you will be able to write essays in English.
2. Modals of Permission (الإذن)
| Modal | Use | Example |
|---|---|---|
| Can | Informal permission | Can I borrow your pen? |
| May | Formal permission | May I come in, please? |
| Could | Polite permission | Could I use your phone? |
| Be allowed to | Permission in all tenses | We are allowed to use dictionaries in the exam. |
✅ BAC Examples:
• May I ask a question, please? (formal)
• Students are allowed to use calculators during the test.
• May I ask a question, please? (formal)
• Students are allowed to use calculators during the test.
3. Modals of Obligation and Necessity (الإلزام والضرورة)
| Modal | Meaning | Example |
|---|---|---|
| Must | Strong obligation (from the speaker) | You must wear a seatbelt. / I must study for the BAC. |
| Have to | External obligation (rules, laws) | Students have to arrive on time. |
| Need to | Necessity | You need to revise all the lessons. |
| Must not (mustn’t) | Prohibition (not allowed) | You must not cheat in the exam. |
| Don’t have to | No obligation (optional) | You don’t have to wear a uniform at this school. |
| Needn’t / Don’t need to | Lack of necessity | You needn’t worry; the exam is easy. |
⚠️ Important Difference:
• Must not (mustn’t) = it is forbidden / not allowed. You mustn’t smoke here.
• Don’t have to = it is not necessary / optional. You don’t have to bring a dictionary.
• Must not (mustn’t) = it is forbidden / not allowed. You mustn’t smoke here.
• Don’t have to = it is not necessary / optional. You don’t have to bring a dictionary.
✅ BAC Examples:
• You must answer all the questions in Section One. (strong advice)
• Candidates have to write their names at the top of the page. (exam rule)
• You must not talk during the listening test. (prohibition)
• You don’t have to translate every word; focus on the main ideas. (not necessary)
• You must answer all the questions in Section One. (strong advice)
• Candidates have to write their names at the top of the page. (exam rule)
• You must not talk during the listening test. (prohibition)
• You don’t have to translate every word; focus on the main ideas. (not necessary)
4. Modals of Advice (النصيحة)
| Modal | Degree | Example |
|---|---|---|
| Should | Strong advice / recommendation | You should practise writing every day. |
| Ought to | Strong advice (more formal) | You ought to respect your parents. |
| Had better | Strong warning / urgent advice | You had better start revising now. |
✅ BAC Examples:
• You should review the passive voice before the exam.
• You had better not wait until the last day to study.
• We ought to protect the environment for future generations.
• You should review the passive voice before the exam.
• You had better not wait until the last day to study.
• We ought to protect the environment for future generations.
5. Modals of Possibility and Probability (الاحتمال)
| Modal | Probability | Example |
|---|---|---|
| May | 50% possibility | It may rain tomorrow. |
| Might | 30% possibility (less certain) | She might come to the party. |
| Could | Possible but not certain | This could be the right answer. |
| Can | General possibility | Smoking can cause cancer. |
| Must | Logical conclusion (95% certain) | He must be tired; he studied all night. |
| Can’t / Couldn’t | Impossible / logical impossibility | That can’t be true! / He couldn’t have done it. |
✅ BAC Examples:
• The results may be announced next week. (possible)
• She studied very hard; she must pass the exam. (logical conclusion)
• He can’t be the director; he is too young. (impossible)
• Pollution can cause serious health problems. (general possibility)
• The results may be announced next week. (possible)
• She studied very hard; she must pass the exam. (logical conclusion)
• He can’t be the director; he is too young. (impossible)
• Pollution can cause serious health problems. (general possibility)
6. Modal Perfects (Modal + Have + Past Participle)
Modal perfects are used to talk about past situations — things that may have happened, should have happened, or could have happened differently.
| Structure | Use | Example |
|---|---|---|
| Must have + P.P. | Certain about the past | He must have studied; his answers are perfect. |
| May/Might have + P.P. | Possible in the past | She may have missed the bus. |
| Could have + P.P. | Possible but didn’t happen | I could have passed if I had studied. |
| Should have + P.P. | Regret / past advice (didn’t happen) | You should have revised more. |
| Would have + P.P. | Imaginary past result | I would have helped if you had asked. |
| Needn’t have + P.P. | Did something unnecessary | I needn’t have brought my umbrella; it didn’t rain. |
| Can’t have + P.P. | Impossible in the past | He can’t have finished already; it’s only been 10 minutes. |
✅ BAC Examples:
• You should have attended the review session yesterday. (regret: you didn’t attend)
• She must have forgotten about the appointment. (logical conclusion)
• I could have chosen a different stream, but I chose Sciences. (past possibility)
• You needn’t have bought the book; the library has copies. (unnecessary action)
• You should have attended the review session yesterday. (regret: you didn’t attend)
• She must have forgotten about the appointment. (logical conclusion)
• I could have chosen a different stream, but I chose Sciences. (past possibility)
• You needn’t have bought the book; the library has copies. (unnecessary action)
7. Semi-Modals: Need and Dare
- Need as a modal (mainly in questions and negatives): Need I wait? / You needn’t worry.
Note: “Need” is more commonly used as a main verb: Do I need to wait? / You don’t need to worry. - Dare as a modal (in questions and negatives): Dare I ask? / I daren’t tell him.
Note: “Dare” is rare in modern English; “dare to” is more common: I didn’t dare to speak.
8. Modal Verbs in the Passive Voice (مبني للمجهول)
In the BAC exam, you will often need to use modals in the passive voice. The structure is:
Modal + be + past participle (present/future)
Modal + have been + past participle (past)
✅ Examples:
• Active: Students must submit their assignments on time.
• Passive: Assignments must be submitted on time.
• Active: Students must submit their assignments on time.
• Passive: Assignments must be submitted on time.
• Active: The government should build more schools.
• Passive: More schools should be built by the government.
• Active: Someone must have stolen the money.
• Passive: The money must have been stolen.
📝 BAC Practice Exercise
Exercise 1: Choose the correct modal to complete each sentence.
- You (must / can / needn’t) park here. It’s forbidden.
- I (can / must / should) speak three languages fluently.
- You (must / should / can) see a doctor; you look ill.
- (May / Must / Need) I open the window? It’s hot in here.
- She (can’t / mustn’t / needn’t) be at home; the lights are off.
Answers: 1. mustn’t, 2. can, 3. should, 4. May, 5. can’t
Exercise 2: Rewrite the sentences using modal perfects.
- Perhaps she missed the train. → She may have missed the train.
- It was a mistake to leave early. → You shouldn’t have left early.
- It was possible to win, but we didn’t. → We could have won the match.
- I’m sure he finished his homework. → He must have finished his homework.
- It was unnecessary to buy milk (but you did). → You needn’t have bought milk.
Exercise 3: Transform from active to passive using modals.
- You must complete the project by Friday. → The project must be completed by Friday.
- We should protect endangered species. → Endangered species should be protected.
- Someone may have stolen the documents. → The documents may have been stolen.
📋 Quick Summary — Modal Auxiliaries for BAC:
Ability: can (present), could (past), be able to (all tenses)
Permission: can (informal), may (formal), could (polite)
Obligation: must (strong), have to (external), mustn’t (prohibition)
No obligation: don’t have to, needn’t
Advice: should, ought to, had better
Possibility: may (50%), might (30%), could, can (general)
Logical conclusion: must (positive), can’t (negative)
Modal Perfects: modal + have + past participle (for past situations)
Passive with Modals: modal + be + P.P. / modal + have been + P.P.
⚠️ Common Mistakes to Avoid
- ❌ “He can to swim.” → ✅ “He can swim.” (No “to” after modals)
- ❌ “She musts study.” → ✅ “She must study.” (Modals don’t take -s in 3rd person)
- ❌ “You must wear a tie? No, you mustn’t.” → ✅ “You don’t have to wear a tie.” (Mustn’t = prohibition, not lack of obligation)
- ❌ “He could pass if he studies.” → ✅ “He can pass if he studies.” (Could is past or unreal, not present possibility)
- ❌ “I must had finished.” → ✅ “I must have finished.” (Modal perfect uses have, not had)
📌 BAC Exam Tips
- Modal verbs often appear in the grammar section (multiple choice and gap-fill).
- Modal perfects (must have, should have, could have) are very common in rewriting exercises.
- In the written expression task, using modals correctly shows a higher level of English proficiency.
- Pay attention to the context — the same modal can have different meanings (e.g., “can” = ability or permission; “must” = obligation or logical conclusion).
- Use modals in your essay to express opinion: “The government should invest more in education.” “Students must be encouraged to read.”
📍 دروس مشابهة:
- Bac English: The Passive Voice – Rules, Forms and Practice – 3rd Year Secondary School
- Bac English: Conditionals (If Clauses) – Types, Rules and Practice – 3rd Year Secondary School
- Bac English: Grammar Summary and Practice – 3rd Year Secondary School
