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 cannot grump you cannot grump he cannot grump we cannot grump you cannot grump they cannot grump	I cannot be grumping you cannot be grumping he cannot be grumping we cannot be grumping you cannot be grumping they cannot be grumping
Perfect	V-ing perfect
I cannot have grumped you cannot have grumped he cannot have grumped we cannot have grumped you cannot have grumped they cannot have grumped	I cannot have been grumping you cannot have been grumping he cannot have been grumping we cannot have been grumping you cannot have been grumping they cannot 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 I not grump? can you not grump? can he not grump? can we not grump? can you not grump? can they not grump?	can I not be grumping? can you not be grumping? can he not be grumping? can we not be grumping? can you not be grumping? can they not be grumping?
Perfect	V-ing perfect
can I not have grumped? can you not have grumped? can he not have grumped? can we not have grumped? can you not have grumped? can they not have grumped?	can I not have been grumping? can you not have been grumping? can he not have been grumping? can we not have been grumping? can you not have been grumping? can they not have been grumping?