Modal Verbs and Expressions in English

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MUS It’s compulsory / indispensable

• Be obligued
• I’m sure / certain
• Duty
• Surely / Certainly + affirmative

MUSTN’T not allowed

• It’s forbidden / prohibited
• Against the law / not permitted

HAVE TO It’s necessary//need

• NEED TO

DON’T HAVE TO It is not necessary

• DOESN’T NEED TO unnecessary

SHOULD / OUGHT TO advise

• A good idea
• If I were you, I would...
• Suggest
• Had better

SHOULDN’T suggest (negative)

• A wrong idea

CAN Know how to

• Have permission
• Have the ability / Be able to

CAN’T Not possible / Impossible

• Definitely (negative)
• I’m sure / certain (negative)

COULD / MAY / MIGHT PROBABILITY

• Perhaps
• Possible
• Probably
• Likely / In case
• Not sure

COULD / MAY / CAN ASKING FOR PERMISSION

COULD ABILITY IN THE PAST

• knew how to / It was possible for me
• WAS/WERE ABLE TO
• managed to

MODAL PERFECTS

• NEEDN’T HAVE PAST PARTICIPLE
• SHOULD HAVE PAST PARTICIPLE
• It would have been a good idea
• It would have been better

SHOULDN’T HAVE PAST PARTICIPLE

• it was silly o It was wrong I