English verb conjugation
COULD GRUMP

Regular verb: grump - grumped - grumped

Affirmation

Simple form	V-ing form
I could grump you could grump he could grump we could grump you could grump they could grump	I could be grumping you could be grumping he could be grumping we could be grumping you could be grumping they could be grumping
Perfect	V-ing perfect
I could have grumped you could have grumped he could have grumped we could have grumped you could have grumped they could have grumped	I could have been grumping you could have been grumping he could have been grumping we could have been grumping you could have been grumping they could have been grumping

Negation

Simple form	V-ing form
I could not grump you could not grump he could not grump we could not grump you could not grump they could not grump	I could not be grumping you could not be grumping he could not be grumping we could not be grumping you could not be grumping they could not be grumping
Perfect	V-ing perfect
I could not have grumped you could not have grumped he could not have grumped we could not have grumped you could not have grumped they could not have grumped	I could not have been grumping you could not have been grumping he could not have been grumping we could not have been grumping you could not have been grumping they could not have been grumping

Interrogative form

Simple form	V-ing form
could I grump? could you grump? could he grump? could we grump? could you grump? could they grump?	could I be grumping? could you be grumping? could he be grumping? could we be grumping? could you be grumping? could they be grumping?
Perfect	V-ing perfect
could I have grumped? could you have grumped? could he have grumped? could we have grumped? could you have grumped? could they have grumped?	could I have been grumping? could you have been grumping? could he have been grumping? could we have been grumping? could you have been grumping? could they have been grumping?

Interro-negative form

Simple form	V-ing form
could I not grump? could you not grump? could he not grump? could we not grump? could you not grump? could they not grump?	could I not be grumping? could you not be grumping? could he not be grumping? could we not be grumping? could you not be grumping? could they not be grumping?
Perfect	V-ing perfect
could I not have grumped? could you not have grumped? could he not have grumped? could we not have grumped? could you not have grumped? could they not have grumped?	could I not have been grumping? could you not have been grumping? could he not have been grumping? could we not have been grumping? could you not have been grumping? could they not have been grumping?