English verb conjugation
MUST FLAIL

Regular verb: flail - flailed - flailed

Affirmation

Simple form	V-ing form
I must flail you must flail he must flail we must flail you must flail they must flail	I must be flailing you must be flailing he must be flailing we must be flailing you must be flailing they must be flailing
Perfect	V-ing perfect
I must have flailed you must have flailed he must have flailed we must have flailed you must have flailed they must have flailed	I must have been flailing you must have been flailing he must have been flailing we must have been flailing you must have been flailing they must have been flailing

Negation

Simple form	V-ing form
I must not flail you must not flail he must not flail we must not flail you must not flail they must not flail	I must not be flailing you must not be flailing he must not be flailing we must not be flailing you must not be flailing they must not be flailing
Perfect	V-ing perfect
I must not have flailed you must not have flailed he must not have flailed we must not have flailed you must not have flailed they must not have flailed	I must not have been flailing you must not have been flailing he must not have been flailing we must not have been flailing you must not have been flailing they must not have been flailing

Interrogative form

Simple form	V-ing form
must I flail? must you flail? must he flail? must we flail? must you flail? must they flail?	must I be flailing? must you be flailing? must he be flailing? must we be flailing? must you be flailing? must they be flailing?
Perfect	V-ing perfect
must I have flailed? must you have flailed? must he have flailed? must we have flailed? must you have flailed? must they have flailed?	must I have been flailing? must you have been flailing? must he have been flailing? must we have been flailing? must you have been flailing? must they have been flailing?

Interro-negative form

Simple form	V-ing form
must I not flail? must you not flail? must he not flail? must we not flail? must you not flail? must they not flail?	must I not be flailing? must you not be flailing? must he not be flailing? must we not be flailing? must you not be flailing? must they not be flailing?
Perfect	V-ing perfect
must I not have flailed? must you not have flailed? must he not have flailed? must we not have flailed? must you not have flailed? must they not have flailed?	must I not have been flailing? must you not have been flailing? must he not have been flailing? must we not have been flailing? must you not have been flailing? must they not have been flailing?