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 couldn't crump
you couldn't crump
he couldn't crump
we couldn't crump
you couldn't crump
they couldn't crump 	I couldn't be crumping
you couldn't be crumping
he couldn't be crumping
we couldn't be crumping
you couldn't be crumping
they couldn't be crumping	I couldn't have crumped
you couldn't have crumped
he couldn't have crumped
we couldn't have crumped
you couldn't have crumped
they couldn't have crumped	I couldn't have been crumping
you couldn't have been crumping
he couldn't have been crumping
we couldn't have been crumping
you couldn't have been crumping
they couldn't 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 	
couldn't I crump?
couldn't you crump?
couldn't he crump?
couldn't we crump?
couldn't you crump?
couldn't they crump? 	couldn't I be crumping?
couldn't you be crumping?
couldn't he be crumping?
couldn't we be crumping?
couldn't you be crumping?
couldn't they be crumping? 	couldn't I have crumped?
couldn't you have crumped?
couldn't he have crumped?
couldn't we have crumped?
couldn't you have crumped?
couldn't they have crumped? 	couldn't I have been crumping?
couldn't you have been crumping?
couldn't he have been crumping?
couldn't we have been crumping?
couldn't you have been crumping?
couldn't they have been crumping?