English verb conjugation
MUST STOPPER

Regular verb: stopper - stoppered - stoppered

Affirmation

Simple form	V-ing form
I must stopper you must stopper he must stopper we must stopper you must stopper they must stopper	I must be stoppering you must be stoppering he must be stoppering we must be stoppering you must be stoppering they must be stoppering
Perfect	V-ing perfect
I must have stoppered you must have stoppered he must have stoppered we must have stoppered you must have stoppered they must have stoppered	I must have been stoppering you must have been stoppering he must have been stoppering we must have been stoppering you must have been stoppering they must have been stoppering

Negation

Simple form	V-ing form
I must not stopper you must not stopper he must not stopper we must not stopper you must not stopper they must not stopper	I must not be stoppering you must not be stoppering he must not be stoppering we must not be stoppering you must not be stoppering they must not be stoppering
Perfect	V-ing perfect
I must not have stoppered you must not have stoppered he must not have stoppered we must not have stoppered you must not have stoppered they must not have stoppered	I must not have been stoppering you must not have been stoppering he must not have been stoppering we must not have been stoppering you must not have been stoppering they must not have been stoppering

Interrogative form

Simple form	V-ing form
must I stopper? must you stopper? must he stopper? must we stopper? must you stopper? must they stopper?	must I be stoppering? must you be stoppering? must he be stoppering? must we be stoppering? must you be stoppering? must they be stoppering?
Perfect	V-ing perfect
must I have stoppered? must you have stoppered? must he have stoppered? must we have stoppered? must you have stoppered? must they have stoppered?	must I have been stoppering? must you have been stoppering? must he have been stoppering? must we have been stoppering? must you have been stoppering? must they have been stoppering?

Interro-negative form

Simple form	V-ing form
must I not stopper? must you not stopper? must he not stopper? must we not stopper? must you not stopper? must they not stopper?	must I not be stoppering? must you not be stoppering? must he not be stoppering? must we not be stoppering? must you not be stoppering? must they not be stoppering?
Perfect	V-ing perfect
must I not have stoppered? must you not have stoppered? must he not have stoppered? must we not have stoppered? must you not have stoppered? must they not have stoppered?	must I not have been stoppering? must you not have been stoppering? must he not have been stoppering? must we not have been stoppering? must you not have been stoppering? must they not have been stoppering?