English verb conjugation
MUST GRUMP

Regular verb: grump - grumped - grumped

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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