could crump
Regular verb: crump - crumped- crumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could crump
you could crump
he could crump
we could crump
you could crump
they could crump 	I could be crumping
you could be crumping
he could be crumping
we could be crumping
you could be crumping
they could be crumping	I could have crumped
you could have crumped
he could have crumped
we could have crumped
you could have crumped
they could have crumped	I could have been crumping
you could have been crumping
he could have been crumping
we could have been crumping
you could have been crumping
they could have been crumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not crump
you could not crump
he could not crump
we could not crump
you could not crump
they could not crump 	I could not be crumping
you could not be crumping
he could not be crumping
we could not be crumping
you could not be crumping
they could not be crumping	I could not have crumped
you could not have crumped
he could not have crumped
we could not have crumped
you could not have crumped
they could not have crumped	I could not have been crumping
you could not have been crumping
he could not have been crumping
we could not have been crumping
you could not have been crumping
they could not have been crumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I crump?
could you crump?
could he crump?
could we crump?
could you crump?
could they crump? 	could I be crumping?
could you be crumping?
could he be crumping?
could we be crumping?
could you be crumping?
could they be crumping? 	could I have crumped?
could you have crumped?
could he have crumped?
could we have crumped?
could you have crumped?
could they have crumped? 	could I have been crumping?
could you have been crumping?
could he have been crumping?
could we have been crumping?
could you have been crumping?
could they have been crumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not crump?
could you not crump?
could he not crump?
could we not crump?
could you not crump?
could they not crump? 	could I not be crumping?
could you not be crumping?
could he not be crumping?
could we not be crumping?
could you not be crumping?
could they not be crumping? 	could I not have crumped?
could you not have crumped?
could he not have crumped?
could we not have crumped?
could you not have crumped?
could they not have crumped? 	could I not have been crumping?
could you not have been crumping?
could he not have been crumping?
could we not have been crumping?
could you not have been crumping?
could they not have been crumping?