could chase
Regular verb: chase - chased- chased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could chase
you could chase
he could chase
we could chase
you could chase
they could chase 	I could be chasing
you could be chasing
he could be chasing
we could be chasing
you could be chasing
they could be chasing	I could have chased
you could have chased
he could have chased
we could have chased
you could have chased
they could have chased	I could have been chasing
you could have been chasing
he could have been chasing
we could have been chasing
you could have been chasing
they could have been chasing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not chase
you could not chase
he could not chase
we could not chase
you could not chase
they could not chase 	I could not be chasing
you could not be chasing
he could not be chasing
we could not be chasing
you could not be chasing
they could not be chasing	I could not have chased
you could not have chased
he could not have chased
we could not have chased
you could not have chased
they could not have chased	I could not have been chasing
you could not have been chasing
he could not have been chasing
we could not have been chasing
you could not have been chasing
they could not have been chasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I chase?
could you chase?
could he chase?
could we chase?
could you chase?
could they chase? 	could I be chasing?
could you be chasing?
could he be chasing?
could we be chasing?
could you be chasing?
could they be chasing? 	could I have chased?
could you have chased?
could he have chased?
could we have chased?
could you have chased?
could they have chased? 	could I have been chasing?
could you have been chasing?
could he have been chasing?
could we have been chasing?
could you have been chasing?
could they have been chasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not chase?
could you not chase?
could he not chase?
could we not chase?
could you not chase?
could they not chase? 	could I not be chasing?
could you not be chasing?
could he not be chasing?
could we not be chasing?
could you not be chasing?
could they not be chasing? 	could I not have chased?
could you not have chased?
could he not have chased?
could we not have chased?
could you not have chased?
could they not have chased? 	could I not have been chasing?
could you not have been chasing?
could he not have been chasing?
could we not have been chasing?
could you not have been chasing?
could they not have been chasing?