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 couldn't grump you couldn't grump he couldn't grump we couldn't grump you couldn't grump they couldn't grump	I couldn't be grumping you couldn't be grumping he couldn't be grumping we couldn't be grumping you couldn't be grumping they couldn't be grumping
Perfect	V-ing perfect
I couldn't have grumped you couldn't have grumped he couldn't have grumped we couldn't have grumped you couldn't have grumped they couldn't have grumped	I couldn't have been grumping you couldn't have been grumping he couldn't have been grumping we couldn't have been grumping you couldn't have been grumping they couldn't 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
couldn't I grump? couldn't you grump? couldn't he grump? couldn't we grump? couldn't you grump? couldn't they grump?	couldn't I be grumping? couldn't you be grumping? couldn't he be grumping? couldn't we be grumping? couldn't you be grumping? couldn't they be grumping?
Perfect	V-ing perfect
couldn't I have grumped? couldn't you have grumped? couldn't he have grumped? couldn't we have grumped? couldn't you have grumped? couldn't they have grumped?	couldn't I have been grumping? couldn't you have been grumping? couldn't he have been grumping? couldn't we have been grumping? couldn't you have been grumping? couldn't they have been grumping?