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MODAL VERBS, Example: Could they have been the killers?, Example: I…
MODAL VERBS
REQUEST
COULD
MAY
CAN (less polite)
CAN I go to the bathroom teacher?
WOULD (the most polite)
PROBABILITY
CAN
MAY
WEAK PROBABILITY
MIGHT
Example: He MIGHT be the killer.
MODAL PERFECTS
Negative
FORM: Subject+Modal verb+not+have+past participle
Question
FORM: Modal verb+Subject+Have+Past pariciple ?
Affirmative
FORM: Subject+modal verb+have+past participle
ADVICE
SHOULD/SHOULDN'T
Example: You SHOULD be more polite.
OUGHT TO/OUGNTN'T TO
ABILITY
CAN (less polite)
ExampIe: I can study for hours without getting distracted.
COULD (PAST ABILITY)
OBLIGATION
MUST
Example: I MUST pick up my little sister.
HAVE/HAS TO
PROHIBITION
MUSTN'T
Example: You MUSTN'T smoke inside the school.
DEDUCTION
MUST
Example: Someone is calling me. it MUST be Peter.
SUGGESTION
SHALL
Example: SHALL we go to the cinema?
NECESSITY
NEED TO
MUST
HAVE TO
Sorry, but I HAVE TO go, it is so late.
NO NECCESSITY
NEEDN'T TO
(DON'T/DOESN'T) HAVE TO
Example: Could they have been the killers?
Example: I shouldn't have cut onion.
Example: Peter might have gone to the park