must shirr
Verbe régulier : shirr - shirred- shirred

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must shirr
you must shirr
he must shirr
we must shirr
you must shirr
they must shirr 	I must be shirring
you must be shirring
he must be shirring
we must be shirring
you must be shirring
they must be shirring	I must have shirred
you must have shirred
he must have shirred
we must have shirred
you must have shirred
they must have shirred	I must have been shirring
you must have been shirring
he must have been shirring
we must have been shirring
you must have been shirring
they must have been shirring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't shirr
you mustn't shirr
he mustn't shirr
we mustn't shirr
you mustn't shirr
they mustn't shirr 	I mustn't be shirring
you mustn't be shirring
he mustn't be shirring
we mustn't be shirring
you mustn't be shirring
they mustn't be shirring	I mustn't have shirred
you mustn't have shirred
he mustn't have shirred
we mustn't have shirred
you mustn't have shirred
they mustn't have shirred	I mustn't have been shirring
you mustn't have been shirring
he mustn't have been shirring
we mustn't have been shirring
you mustn't have been shirring
they mustn't have been shirring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I shirr?
must you shirr?
must he shirr?
must we shirr?
must you shirr?
must they shirr? 	must I be shirring?
must you be shirring?
must he be shirring?
must we be shirring?
must you be shirring?
must they be shirring? 	must I have shirred?
must you have shirred?
must he have shirred?
must we have shirred?
must you have shirred?
must they have shirred? 	must I have been shirring?
must you have been shirring?
must he have been shirring?
must we have been shirring?
must you have been shirring?
must they have been shirring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I shirr?
mustn't you shirr?
mustn't he shirr?
mustn't we shirr?
mustn't you shirr?
mustn't they shirr? 	mustn't I be shirring?
mustn't you be shirring?
mustn't he be shirring?
mustn't we be shirring?
mustn't you be shirring?
mustn't they be shirring? 	mustn't I have shirred?
mustn't you have shirred?
mustn't he have shirred?
mustn't we have shirred?
mustn't you have shirred?
mustn't they have shirred? 	mustn't I have been shirring?
mustn't you have been shirring?
mustn't he have been shirring?
mustn't we have been shirring?
mustn't you have been shirring?
mustn't they have been shirring?