I could act you could act she could act we could act you could act they could act
V-ing form
I could be acting you could be acting she could be acting we could be acting you could be acting they could be acting
Perfect
I could have acted you could have acted she could have acted we could have acted you could have acted they could have acted
V-ing perfect
I could have been acting you could have been acting she could have been acting we could have been acting you could have been acting they could have been acting
Negation
Simple form
I could not act you could not act she could not act we could not act you could not act they could not act
V-ing form
I could not be acting you could not be acting she could not be acting we could not be acting you could not be acting they could not be acting
Perfect
I could not have acted you could not have acted she could not have acted we could not have acted you could not have acted they could not have acted
V-ing perfect
I could not have been acting you could not have been acting she could not have been acting we could not have been acting you could not have been acting they could not have been acting
Interrogative form
Simple form
could I act? could you act? could she act? could we act? could you act? could they act?
V-ing form
could I be acting? could you be acting? could she be acting? could we be acting? could you be acting? could they be acting?
Perfect
could I have acted? could you have acted? could she have acted? could we have acted? could you have acted? could they have acted?
V-ing perfect
could I have been acting? could you have been acting? could she have been acting? could we have been acting? could you have been acting? could they have been acting?
Interro-negative form
Simple form
could I not act? could you not act? could she not act? could we not act? could you not act? could they not act?
V-ing form
could I not be acting? could you not be acting? could she not be acting? could we not be acting? could you not be acting? could they not be acting?
Perfect
could I not have acted? could you not have acted? could she not have acted? could we not have acted? could you not have acted? could they not have acted?
V-ing perfect
could I not have been acting? could you not have been acting? could she not have been acting? could we not have been acting? could you not have been acting? could they not have been acting?