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Modal Verbs Class 8: Functions, Rules and Exercises

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EnglishCBSE Class 8 · Wisdom Paves the Way

Modal Verbs, Class 8 English: Functions, Rules and Solved Exercises

Updated 17 October 2026 · Fact-checked

Modal verbs (can, could, may, might, must, shall, should, will, would, ought to, need to) are helping verbs that add meaning such as ability, possibility, certainty, advice, obligation, permission or a wish. A modal is always followed by the base form of the main verb, so we say "must go" and not "must goes". Modal + have + past participle talks about the past.

A modal always sits before the plain base verb and never takes -s or -ing; its meaning tells you the function.

Illustration drawn for QuestionBuddy.

Understand Modal Verbs and Their Functions (Class 8)

What a modal does. A modal verb is placed before the main verb to show the speaker's attitude. It never changes for the subject (he can, not he cans) and the verb after it is in the base form (can swim, may rain).

Main functions with examples.

  • Ability: can, could. "The four men can read tracks."
  • Permission: may, can. "May I come in?"
  • Possibility: may, might, could. "The merchant may be lying." (might is weaker)
  • Logical conclusion (certainty): must. "You must have stolen it" means the speaker feels sure. Must + have + past participle is about the past.
  • Hypothetical past: would have + past participle. "The tail would have swished them away" means it did not happen.
  • Advice and moral duty: should, ought to. "You should be careful whom you accuse."
  • Necessity or rule: must, need to, have to. "You must wear a helmet."
  • Wish or blessing: may. "May your wisdom shine."
  • Command with you: shall. "You shall come with me."
  • Willingness or promise: will. "I will gladly pay."

Common mistakes. Adding -s or -ing after a modal (can goes, must going); using to after most modals (should to go); and using two modals together (will can). The exceptions are ought to and need to, which include to.

Present and past. Could, would and might are sometimes past forms (He said he could swim) and sometimes polite or less certain forms (Could you help me?).

Answer tip. In a "name the function" question, quote the sentence and label the function in one word.

Modal Verbs and Their Functions (Class 8): key facts

Ability and permission
can, could: ability | may, can: permission
May is more formal.
Possibility and certainty
may, might, could: possible | must: logically certain
Might is less sure than may.
Advice and necessity
should, ought to: advice | must, need to: necessity
Must is stronger than should.
Past forms
must have + V3conclusion
would have + V3unreal past
could have + V3missed chance
V3 is the past participle.

Modal Verbs and Their Functions (Class 8) in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Choosing the right modal for the message

Suppose a school notice says, "Students must wear ID cards", and the Class 8 teacher tells Tara, "You should drink more water during sports day." On the way home, Tara sees a closed shop and says, "It must be a holiday."

Name the function of each modal.

Try it first, then show the solutionSolution
  1. Must in the notice is a rule: necessity.
  2. Should in the teacher's sentence is friendly advice.
  3. Must in Tara's sentence is a confident guess: logical conclusion.

Answer: Rule or necessity; advice; logical conclusion. The same modal word (must) can have two functions, so always read the sentence.

Memory hook: Same word, different job: check the context.

Tricks to remember Modal Verbs and Their Functions (Class 8)

Short memory aids. Say each one aloud once, then use it on a question the same day.

  • P-A-P-A-N

    Permission, Ability, Possibility, Advice, Necessity.

    Use it when: A quick list of functions.

  • Base verb only

    After a modal, the verb stays plain.

    Use it when: Avoid can goes and must going.

  • Must have = sure

    must have + V3 means "I am sure it happened".

    Use it when: Past conclusions.

Modal Verbs and Their Functions (Class 8): solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Choose the modal · 1 mark · MCQBoard level

Fill in the blank: You ___ be careful whom you accuse, as the King told the merchant.
(a) can (b) should (c) might (d) shall

Try it first, then show the solutionSolution
  1. The King gives advice or a moral duty, so should (1 mark).

Answer: (b)

Example 2: Name the function · 2 marks · Short answerBoard level

Name the function of the modal in capitals.
(i) MAY your wisdom shine for ever.
(ii) Rani CAN solve any puzzle.

Try it first, then show the solutionSolution
  1. (i) a wish or blessing (1).
  2. (ii) ability (1).

Answer: (i) wish or blessing (ii) ability

Example 3: Correct the sentences · 3 marks · Short answerHarder board level

Correct the sentences.
(i) She can sings very well.
(ii) You should to wear a helmet.
(iii) The road is wet, so it must rained last night.

Try it first, then show the solutionSolution
  1. (i) base form after can (1).
  2. (ii) no to after should (1).
  3. (iii) must have + past participle (1).

Answer: (i) She can sing very well. (ii) You should wear a helmet. (iii) The road is wet, so it must have rained last night.

Example 4: Rewrite with a modal · 4 marks · Short answerHarder board level

Rewrite using a suitable modal without changing the meaning.
(i) It is possible that the merchant is lying.
(ii) I am sure the men studied the tracks carefully.
(iii) It is a good idea to ask the teacher.
(iv) I permit you to go out.

Try it first, then show the solutionSolution
  1. (i) may/might be lying (1).
  2. (ii) must have studied (1).
  3. (iii) should ask (1).
  4. (iv) may go out (1).

Answer: (i) The merchant may be lying. (ii) The men must have studied the tracks carefully. (iii) You should ask the teacher. (iv) You may go out.

Example 5: Writing with modals · 5 marks · Long answerHOTS / competency

Write a paragraph of 60-80 words giving rules and advice for students who study late in the night, using at least five different modals and writing them in capitals.

Try it first, then show the solutionSolution
  1. Rules: must, need to (1.5).
  2. Advice: should, ought to (1.5).
  3. Possibility or permission: may, might, can (1).
  4. Coherence and expression (1).

Answer: Students who study late MUST switch off screens by ten o'clock and SHOULD sleep at least eight hours. You OUGHT TO eat a light dinner, because heavy food MAY keep you awake. You CAN revise easy chapters at night, but you NEED TO leave the harder ones for the morning. If you sleep too little, you MIGHT feel tired in class, and you MAY forget what you have learnt.

Where students lose marks in Modal Verbs and Their Functions (Class 8)

The slips examiners see most often, and what to write instead.

  • Mistake: Adding -s or -ing after a modal

    A modal is followed by the base verb.

    Wrong working

    He can runs fast.

    Right working

    He can run fast.

    Do this: Keep the verb plain.

    Usually costs: 1 mark.

  • Mistake: Using to after should or must

    Only ought and need keep to.

    Wrong working

    You should to go.

    Right working

    You should go.

    Do this: Drop to except in ought to and need to.

    Usually costs: 1 mark.

  • Mistake: Writing must rained for a past conclusion

    The past needs have + past participle.

    Wrong working

    It must rained.

    Right working

    It must have rained.

    Do this: Use must have + V3.

    Usually costs: 1 mark.

  • Mistake: Naming only the modal, not its function

    The question asks what the modal shows.

    Wrong working

    Must is a modal.

    Right working

    Must shows a logical conclusion in this sentence.

    Do this: Label the function in one word.

    Usually costs: 1 mark.

Exam tips

  • Always follow a modal with the base form of the verb.
  • Read the whole sentence before naming the function, since must has two uses.
  • For past conclusions, write must have + past participle.
  • Use may or might for possibility, should for advice and must for rules.
  • Do not use two modals together.

Practice questions on Modal Verbs and Their Functions (Class 8)

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

  1. Q1 · 1 mark · MCQBoard level

    Which sentence shows a logical conclusion?
    (a) You must wear a helmet. (b) She must have missed the bus. (c) May I come in? (d) We can swim.

    Hint

    Look for must have + past participle.

    Answer

    (b)

  2. Q2 · 2 marks · Short answerBoard level

    Fill in with a suitable modal: (i) ___ I borrow your pen? (ii) You ___ not cheat in the test.

    Hint

    One asks permission, the other is a rule.

    Answer

    (i) May (or Can) (ii) must

  3. Q3 · 1 mark · Assertion-reasonHarder board level

    Assertion (A): In "If the camel had had a long tail, it would have swished the insects away," would have shows an unreal past.
    Reason (R): The camel did not have a long tail, so the swishing did not happen.
    (a) Both A and R are true and R explains A
    (b) Both are true but R does not explain A
    (c) A is true but R is false
    (d) A is false but R is true

    Hint

    Would have + V3 describes something that did not happen.

    Answer

    (a)

  4. Q4 · 3 marks · Short answerHarder board level

    Explain the difference in meaning between the two sentences.
    (i) She may be at home. (ii) She must be at home.

    Hint

    One is a possibility, the other a strong conclusion.

    Answer

    In sentence (i) may shows only a possibility: the speaker is not sure whether she is at home. In sentence (ii) must shows a logical conclusion: the speaker has clues and feels almost certain she is at home.

  5. Q5 · 5 marks · Long answerHOTS / competency

    Write a short dialogue (60-80 words) between a teacher and a Class 8 student about preparing for the final exams. Use at least four modals with four different functions.

    Hint

    Advice, ability, necessity and possibility.

    Answer

    Teacher: You should revise one subject every day. Student: I can finish English by Friday, madam, but I may need help with grammar. Teacher: You must bring your doubts to class tomorrow, and you might also form a study group. Student: May I use the library period for that? Teacher: Yes, you may. You ought to start early, because last-minute study will not help.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

  1. 1.What follows a modal verb?Show answer

    The base form of the main verb.

  2. 2.Which modal shows a wish or blessing?Show answer

    May.

  3. 3.Which is more certain: may or must?Show answer

    Must.

  4. 4.What does must have + V3 express?Show answer

    A logical conclusion about the past.

  5. 5.Which two modals include to?Show answer

    Ought to and need to.

  6. 6.Which modal is used for advice?Show answer

    Should (also ought to).

Modal Verbs and Their Functions (Class 8): frequently asked questions

Do modal verbs change with the subject?

No. We say he can, she can and they can.

Is will a modal?

Yes. It shows the future, willingness or promise.

Why is this grammar in Wisdom Paves the Way?

The play uses many modals, such as "You must have stolen it", so the lesson teaches their functions.

How are modals tested in school exams?

Through fill in the blanks, naming functions and correcting errors.