can clump
Regular verb: clump - clumped- clumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can clump
you can clump
she can clump
we can clump
you can clump
they can clump 	I can be clumping
you can be clumping
she can be clumping
we can be clumping
you can be clumping
they can be clumping	I can have clumped
you can have clumped
she can have clumped
we can have clumped
you can have clumped
they can have clumped	I can have been clumping
you can have been clumping
she can have been clumping
we can have been clumping
you can have been clumping
they can have been clumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't clump
you can't clump
she can't clump
we can't clump
you can't clump
they can't clump 	I can't be clumping
you can't be clumping
she can't be clumping
we can't be clumping
you can't be clumping
they can't be clumping	I can't have clumped
you can't have clumped
she can't have clumped
we can't have clumped
you can't have clumped
they can't have clumped	I can't have been clumping
you can't have been clumping
she can't have been clumping
we can't have been clumping
you can't have been clumping
they can't have been clumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I clump?
can you clump?
can she clump?
can we clump?
can you clump?
can they clump? 	can I be clumping?
can you be clumping?
can she be clumping?
can we be clumping?
can you be clumping?
can they be clumping? 	can I have clumped?
can you have clumped?
can she have clumped?
can we have clumped?
can you have clumped?
can they have clumped? 	can I have been clumping?
can you have been clumping?
can she have been clumping?
can we have been clumping?
can you have been clumping?
can they have been clumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I clump?
can't you clump?
can't she clump?
can't we clump?
can't you clump?
can't they clump? 	can't I be clumping?
can't you be clumping?
can't she be clumping?
can't we be clumping?
can't you be clumping?
can't they be clumping? 	can't I have clumped?
can't you have clumped?
can't she have clumped?
can't we have clumped?
can't you have clumped?
can't they have clumped? 	can't I have been clumping?
can't you have been clumping?
can't she have been clumping?
can't we have been clumping?
can't you have been clumping?
can't they have been clumping?