English verb conjugation
COULD CLUMP

Regular verb: clump - clumped - clumped

Affirmation

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

Negation

Simple form	V-ing form
I could not clump you could not clump she could not clump we could not clump you could not clump they could not clump	I could not be clumping you could not be clumping she could not be clumping we could not be clumping you could not be clumping they could not be clumping
Perfect	V-ing perfect
I could not have clumped you could not have clumped she could not have clumped we could not have clumped you could not have clumped they could not have clumped	I could not have been clumping you could not have been clumping she could not have been clumping we could not have been clumping you could not have been clumping they could not have been clumping

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not clump? could you not clump? could she not clump? could we not clump? could you not clump? could they not clump?	could I not be clumping? could you not be clumping? could she not be clumping? could we not be clumping? could you not be clumping? could they not be clumping?
Perfect	V-ing perfect
could I not have clumped? could you not have clumped? could she not have clumped? could we not have clumped? could you not have clumped? could they not have clumped?	could I not have been clumping? could you not have been clumping? could she not have been clumping? could we not have been clumping? could you not have been clumping? could they not have been clumping?