English verb conjugation
COULD DECELERATE

Regular verb: decelerate - decelerated - decelerated

Affirmation

Simple form	V-ing form
I could decelerate you could decelerate he could decelerate we could decelerate you could decelerate they could decelerate	I could be decelerating you could be decelerating he could be decelerating we could be decelerating you could be decelerating they could be decelerating
Perfect	V-ing perfect
I could have decelerated you could have decelerated he could have decelerated we could have decelerated you could have decelerated they could have decelerated	I could have been decelerating you could have been decelerating he could have been decelerating we could have been decelerating you could have been decelerating they could have been decelerating

Negation

Simple form	V-ing form
I couldn't decelerate you couldn't decelerate he couldn't decelerate we couldn't decelerate you couldn't decelerate they couldn't decelerate	I couldn't be decelerating you couldn't be decelerating he couldn't be decelerating we couldn't be decelerating you couldn't be decelerating they couldn't be decelerating
Perfect	V-ing perfect
I couldn't have decelerated you couldn't have decelerated he couldn't have decelerated we couldn't have decelerated you couldn't have decelerated they couldn't have decelerated	I couldn't have been decelerating you couldn't have been decelerating he couldn't have been decelerating we couldn't have been decelerating you couldn't have been decelerating they couldn't have been decelerating

Interrogative form

Simple form	V-ing form
could I decelerate? could you decelerate? could he decelerate? could we decelerate? could you decelerate? could they decelerate?	could I be decelerating? could you be decelerating? could he be decelerating? could we be decelerating? could you be decelerating? could they be decelerating?
Perfect	V-ing perfect
could I have decelerated? could you have decelerated? could he have decelerated? could we have decelerated? could you have decelerated? could they have decelerated?	could I have been decelerating? could you have been decelerating? could he have been decelerating? could we have been decelerating? could you have been decelerating? could they have been decelerating?

Interro-negative form

Simple form	V-ing form
couldn't I decelerate? couldn't you decelerate? couldn't he decelerate? couldn't we decelerate? couldn't you decelerate? couldn't they decelerate?	couldn't I be decelerating? couldn't you be decelerating? couldn't he be decelerating? couldn't we be decelerating? couldn't you be decelerating? couldn't they be decelerating?
Perfect	V-ing perfect
couldn't I have decelerated? couldn't you have decelerated? couldn't he have decelerated? couldn't we have decelerated? couldn't you have decelerated? couldn't they have decelerated?	couldn't I have been decelerating? couldn't you have been decelerating? couldn't he have been decelerating? couldn't we have been decelerating? couldn't you have been decelerating? couldn't they have been decelerating?