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