I could accelerate you could accelerate he could accelerate we could accelerate you could accelerate they could accelerate
V-ing form
I could be accelerating you could be accelerating he could be accelerating we could be accelerating you could be accelerating they could be accelerating
Perfect
I could have accelerated you could have accelerated he could have accelerated we could have accelerated you could have accelerated they could have accelerated
V-ing perfect
I could have been accelerating you could have been accelerating he could have been accelerating we could have been accelerating you could have been accelerating they could have been accelerating
Negation
Simple form
I could not accelerate you could not accelerate he could not accelerate we could not accelerate you could not accelerate they could not accelerate
V-ing form
I could not be accelerating you could not be accelerating he could not be accelerating we could not be accelerating you could not be accelerating they could not be accelerating
Perfect
I could not have accelerated you could not have accelerated he could not have accelerated we could not have accelerated you could not have accelerated they could not have accelerated
V-ing perfect
I could not have been accelerating you could not have been accelerating he could not have been accelerating we could not have been accelerating you could not have been accelerating they could not have been accelerating
Interrogative form
Simple form
could I accelerate? could you accelerate? could he accelerate? could we accelerate? could you accelerate? could they accelerate?
V-ing form
could I be accelerating? could you be accelerating? could he be accelerating? could we be accelerating? could you be accelerating? could they be accelerating?
Perfect
could I have accelerated? could you have accelerated? could he have accelerated? could we have accelerated? could you have accelerated? could they have accelerated?
V-ing perfect
could I have been accelerating? could you have been accelerating? could he have been accelerating? could we have been accelerating? could you have been accelerating? could they have been accelerating?
Interro-negative form
Simple form
could I not accelerate? could you not accelerate? could he not accelerate? could we not accelerate? could you not accelerate? could they not accelerate?
V-ing form
could I not be accelerating? could you not be accelerating? could he not be accelerating? could we not be accelerating? could you not be accelerating? could they not be accelerating?
Perfect
could I not have accelerated? could you not have accelerated? could he not have accelerated? could we not have accelerated? could you not have accelerated? could they not have accelerated?
V-ing perfect
could I not have been accelerating? could you not have been accelerating? could he not have been accelerating? could we not have been accelerating? could you not have been accelerating? could they not have been accelerating?