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Modals

Modal verbs express ability, possibility, permission, obligation, and more.

Overview

Word Description Examples
Can Ability, possibility, or permission I can swim.
I cannot (can't) swim.
Can I swim?
Could Past ability, polite requests, or possibilities I could swim when I was younger.
I couldn't swim.
Could I swim?
May Permission or a possibility that is more likely You may leave the room.
You may not leave.
May I leave the room?
Might A possibility that is less certain It might rain today.
It might not rain.
Might it rain today?
Must Necessity, strong obligation, or a logical conclusion You must wear a seatbelt.
You mustn't smoke here.
Must I wear a seatbelt?
Ought to Moral obligation or advice (similar to "should") You ought to help your friends.
You ought not to ignore responsibilities.
Ought I to help?
Shall Offering/suggesting something, or future actions (formal) I shall return by evening.
I shall not go.
Shall I open the window?
Should Advice, recommendations, or expectations You should study for the exam.
You shouldn't waste time.
Should I study?
Would Polite requests, hypothetical situations, or preferences I would like a cup of tea.
I wouldn't ask him.
Would you like some coffee?

Usage Details

Can — expresses present ability, possibility, or permission.

  • Ability: I can swim.
  • Possibility: It can get very cold here.
  • Permission: Can I leave early?

Could — expresses past ability, polite requests, or conditional possibility.

  • Past ability: I could swim when I was younger.
  • Polite request: Could you help me?
  • Possibility: It could rain tomorrow.

May — expresses permission or a possibility that is more likely.

  • Permission: You may leave the room.
  • Possibility: It may rain today.

Might — expresses a possibility that is less certain.

  • Uncertainty: It might rain today.
  • Suggestion: You might want to check that.

Must — strong obligation or logical conclusion.

  • Obligation: You must wear a seatbelt.
  • Logical conclusion: She must be tired after that long trip.

Should — advice, recommendations, or expectations.

  • Advice: You should study for the exam.
  • Expectation: The package should arrive tomorrow.

Ought to — moral obligation or advice, similar to "should".

  • Moral obligation: You ought to help your friends.

Shall — offers, suggestions, or formal future actions.

  • Offer: Shall I open the window?
  • Formal future: I shall return by evening.

Would — polite requests, hypothetical situations, or preferences.

  • Polite request: Would you like some coffee?
  • Hypothetical: I would buy a house if I had the money.
  • Preference: I would rather stay home.