could act
Regular verb: act - acted- acted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could act
you could act
he could act
we could act
you could act
they could act 	I could be acting
you could be acting
he could be acting
we could be acting
you could be acting
they could be acting	I could have acted
you could have acted
he could have acted
we could have acted
you could have acted
they could have acted	I could have been acting
you could have been acting
he could have been acting
we could have been acting
you could have been acting
they could have been acting	

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

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