I must decelerate you must decelerate he must decelerate we must decelerate you must decelerate they must decelerate
V-ing form
I must be decelerating you must be decelerating he must be decelerating we must be decelerating you must be decelerating they must be decelerating
Perfect
I must have decelerated you must have decelerated he must have decelerated we must have decelerated you must have decelerated they must have decelerated
V-ing perfect
I must have been decelerating you must have been decelerating he must have been decelerating we must have been decelerating you must have been decelerating they must have been decelerating
Negation
Simple form
I must not decelerate you must not decelerate he must not decelerate we must not decelerate you must not decelerate they must not decelerate
V-ing form
I must not be decelerating you must not be decelerating he must not be decelerating we must not be decelerating you must not be decelerating they must not be decelerating
Perfect
I must not have decelerated you must not have decelerated he must not have decelerated we must not have decelerated you must not have decelerated they must not have decelerated
V-ing perfect
I must not have been decelerating you must not have been decelerating he must not have been decelerating we must not have been decelerating you must not have been decelerating they must not have been decelerating
Interrogative form
Simple form
must I decelerate? must you decelerate? must he decelerate? must we decelerate? must you decelerate? must they decelerate?
V-ing form
must I be decelerating? must you be decelerating? must he be decelerating? must we be decelerating? must you be decelerating? must they be decelerating?
Perfect
must I have decelerated? must you have decelerated? must he have decelerated? must we have decelerated? must you have decelerated? must they have decelerated?
V-ing perfect
must I have been decelerating? must you have been decelerating? must he have been decelerating? must we have been decelerating? must you have been decelerating? must they have been decelerating?
Interro-negative form
Simple form
must I not decelerate? must you not decelerate? must he not decelerate? must we not decelerate? must you not decelerate? must they not decelerate?
V-ing form
must I not be decelerating? must you not be decelerating? must he not be decelerating? must we not be decelerating? must you not be decelerating? must they not be decelerating?
Perfect
must I not have decelerated? must you not have decelerated? must he not have decelerated? must we not have decelerated? must you not have decelerated? must they not have decelerated?
V-ing perfect
must I not have been decelerating? must you not have been decelerating? must he not have been decelerating? must we not have been decelerating? must you not have been decelerating? must they not have been decelerating?