must grump
Verbe régulier : grump - grumped- grumped

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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	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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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	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	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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? 	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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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? 	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?