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
she must grump
we must grump
you must grump
they must grump 	I must be grumping
you must be grumping
she must be grumping
we must be grumping
you must be grumping
they must be grumping	I must have grumped
you must have grumped
she 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
she 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 mustn't grump
you mustn't grump
she mustn't grump
we mustn't grump
you mustn't grump
they mustn't grump 	I mustn't be grumping
you mustn't be grumping
she mustn't be grumping
we mustn't be grumping
you mustn't be grumping
they mustn't be grumping	I mustn't have grumped
you mustn't have grumped
she mustn't have grumped
we mustn't have grumped
you mustn't have grumped
they mustn't have grumped	I mustn't have been grumping
you mustn't have been grumping
she mustn't have been grumping
we mustn't have been grumping
you mustn't have been grumping
they mustn't have been grumping	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I grump?
must you grump?
must she grump?
must we grump?
must you grump?
must they grump? 	must I be grumping?
must you be grumping?
must she be grumping?
must we be grumping?
must you be grumping?
must they be grumping? 	must I have grumped?
must you have grumped?
must she 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 she 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 	
mustn't I grump?
mustn't you grump?
mustn't she grump?
mustn't we grump?
mustn't you grump?
mustn't they grump? 	mustn't I be grumping?
mustn't you be grumping?
mustn't she be grumping?
mustn't we be grumping?
mustn't you be grumping?
mustn't they be grumping? 	mustn't I have grumped?
mustn't you have grumped?
mustn't she have grumped?
mustn't we have grumped?
mustn't you have grumped?
mustn't they have grumped? 	mustn't I have been grumping?
mustn't you have been grumping?
mustn't she have been grumping?
mustn't we have been grumping?
mustn't you have been grumping?
mustn't they have been grumping?