English verb conjugation
MUST FLAP

Regular verb: flap - flapped - flapped

Affirmation

Simple form	V-ing form
I must flap you must flap he must flap we must flap you must flap they must flap	I must be flapping you must be flapping he must be flapping we must be flapping you must be flapping they must be flapping
Perfect	V-ing perfect
I must have flapped you must have flapped he must have flapped we must have flapped you must have flapped they must have flapped	I must have been flapping you must have been flapping he must have been flapping we must have been flapping you must have been flapping they must have been flapping

Negation

Simple form	V-ing form
I must not flap you must not flap he must not flap we must not flap you must not flap they must not flap	I must not be flapping you must not be flapping he must not be flapping we must not be flapping you must not be flapping they must not be flapping
Perfect	V-ing perfect
I must not have flapped you must not have flapped he must not have flapped we must not have flapped you must not have flapped they must not have flapped	I must not have been flapping you must not have been flapping he must not have been flapping we must not have been flapping you must not have been flapping they must not have been flapping

Interrogative form

Simple form	V-ing form
must I flap? must you flap? must he flap? must we flap? must you flap? must they flap?	must I be flapping? must you be flapping? must he be flapping? must we be flapping? must you be flapping? must they be flapping?
Perfect	V-ing perfect
must I have flapped? must you have flapped? must he have flapped? must we have flapped? must you have flapped? must they have flapped?	must I have been flapping? must you have been flapping? must he have been flapping? must we have been flapping? must you have been flapping? must they have been flapping?

Interro-negative form

Simple form	V-ing form
must I not flap? must you not flap? must he not flap? must we not flap? must you not flap? must they not flap?	must I not be flapping? must you not be flapping? must he not be flapping? must we not be flapping? must you not be flapping? must they not be flapping?
Perfect	V-ing perfect
must I not have flapped? must you not have flapped? must he not have flapped? must we not have flapped? must you not have flapped? must they not have flapped?	must I not have been flapping? must you not have been flapping? must he not have been flapping? must we not have been flapping? must you not have been flapping? must they not have been flapping?