English verb conjugation
CAN GRUMP

Regular verb: grump - grumped - grumped

Affirmation

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

Negation

Simple form	V-ing form
I can't grump you can't grump he can't grump we can't grump you can't grump they can't grump	I can't be grumping you can't be grumping he can't be grumping we can't be grumping you can't be grumping they can't be grumping
Perfect	V-ing perfect
I can't have grumped you can't have grumped he can't have grumped we can't have grumped you can't have grumped they can't have grumped	I can't have been grumping you can't have been grumping he can't have been grumping we can't have been grumping you can't have been grumping they can't have been grumping

Interrogative form

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

Interro-negative form

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