must pi
Verbe régulier : pi - pied- pied

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must pi
you must pi
she must pi
we must pi
you must pi
they must pi 	I must be piing
you must be piing
she must be piing
we must be piing
you must be piing
they must be piing	I must have pied
you must have pied
she must have pied
we must have pied
you must have pied
they must have pied	I must have been piing
you must have been piing
she must have been piing
we must have been piing
you must have been piing
they must have been piing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't pi
you mustn't pi
she mustn't pi
we mustn't pi
you mustn't pi
they mustn't pi 	I mustn't be piing
you mustn't be piing
she mustn't be piing
we mustn't be piing
you mustn't be piing
they mustn't be piing	I mustn't have pied
you mustn't have pied
she mustn't have pied
we mustn't have pied
you mustn't have pied
they mustn't have pied	I mustn't have been piing
you mustn't have been piing
she mustn't have been piing
we mustn't have been piing
you mustn't have been piing
they mustn't have been piing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I pi?
must you pi?
must she pi?
must we pi?
must you pi?
must they pi? 	must I be piing?
must you be piing?
must she be piing?
must we be piing?
must you be piing?
must they be piing? 	must I have pied?
must you have pied?
must she have pied?
must we have pied?
must you have pied?
must they have pied? 	must I have been piing?
must you have been piing?
must she have been piing?
must we have been piing?
must you have been piing?
must they have been piing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I pi?
mustn't you pi?
mustn't she pi?
mustn't we pi?
mustn't you pi?
mustn't they pi? 	mustn't I be piing?
mustn't you be piing?
mustn't she be piing?
mustn't we be piing?
mustn't you be piing?
mustn't they be piing? 	mustn't I have pied?
mustn't you have pied?
mustn't she have pied?
mustn't we have pied?
mustn't you have pied?
mustn't they have pied? 	mustn't I have been piing?
mustn't you have been piing?
mustn't she have been piing?
mustn't we have been piing?
mustn't you have been piing?
mustn't they have been piing?