can crump
Regular verb: crump - crumped- crumped

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot crump
you cannot crump
she cannot crump
we cannot crump
you cannot crump
they cannot crump 	I cannot be crumping
you cannot be crumping
she cannot be crumping
we cannot be crumping
you cannot be crumping
they cannot be crumping	I cannot have crumped
you cannot have crumped
she cannot have crumped
we cannot have crumped
you cannot have crumped
they cannot have crumped	I cannot have been crumping
you cannot have been crumping
she cannot have been crumping
we cannot have been crumping
you cannot have been crumping
they cannot have been crumping	

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

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