FUNCTION
MODAL VERB FOR ABILITIES, PERMISSIONS & UNFORMAL EXPRESSIONS
CAN
CAN INTERROGATIVE
CAN+SUBJ+VERB+COMPLEMENT?
NEGATIVE FORM FOR CAN WITH AND WITHOUT CONTRATION
CAN'T-CANNOT
PHRASAL MODALS FOR PERMISSION.
BE ALLOWED TO
BE PERMITTED TO
SHOULD NEGATIVE
SUBJ+AUX+VERB+COMPLEMENT
MODAL VERBS WITHOUT CONTRATIONS
MAY & MIGHT
MODAL VERB TO EXPRESS POSSIBLE FUTURE
WOULD
MUST POSITIVE
SUB+AUX+VERB+COMPLEMENT
NEGATIVE FORM FOR OUGHT TO
NO NEGATIVE FORM
PHRASAL MODAL TO EXPRESS OBLIGATION (NECESSITY)
HAVE TO
BE ABLE TO POSITIVE
SUB+AUX+VERB+COMPLEMENT
PHRASAL MODALS WITHOUT THE PREPOSITION "TO"
HAD BETTER
PHRASAL MODAL TO EXPRESS A WARNING OR THREAT
HAD BETTER
HAVE TO INTERROGATIVE
AUX+SUB+VERB+COMPLEMENT?
NEGATIVE FORM FOR
HAVE GOT TO