must shutter
Verbe régulier : shutter - shuttered- shuttered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must shutter
you must shutter
he must shutter
we must shutter
you must shutter
they must shutter 	I must be shuttering
you must be shuttering
he must be shuttering
we must be shuttering
you must be shuttering
they must be shuttering	I must have shuttered
you must have shuttered
he must have shuttered
we must have shuttered
you must have shuttered
they must have shuttered	I must have been shuttering
you must have been shuttering
he must have been shuttering
we must have been shuttering
you must have been shuttering
they must have been shuttering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't shutter
you mustn't shutter
he mustn't shutter
we mustn't shutter
you mustn't shutter
they mustn't shutter 	I mustn't be shuttering
you mustn't be shuttering
he mustn't be shuttering
we mustn't be shuttering
you mustn't be shuttering
they mustn't be shuttering	I mustn't have shuttered
you mustn't have shuttered
he mustn't have shuttered
we mustn't have shuttered
you mustn't have shuttered
they mustn't have shuttered	I mustn't have been shuttering
you mustn't have been shuttering
he mustn't have been shuttering
we mustn't have been shuttering
you mustn't have been shuttering
they mustn't have been shuttering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I shutter?
must you shutter?
must he shutter?
must we shutter?
must you shutter?
must they shutter? 	must I be shuttering?
must you be shuttering?
must he be shuttering?
must we be shuttering?
must you be shuttering?
must they be shuttering? 	must I have shuttered?
must you have shuttered?
must he have shuttered?
must we have shuttered?
must you have shuttered?
must they have shuttered? 	must I have been shuttering?
must you have been shuttering?
must he have been shuttering?
must we have been shuttering?
must you have been shuttering?
must they have been shuttering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I shutter?
mustn't you shutter?
mustn't he shutter?
mustn't we shutter?
mustn't you shutter?
mustn't they shutter? 	mustn't I be shuttering?
mustn't you be shuttering?
mustn't he be shuttering?
mustn't we be shuttering?
mustn't you be shuttering?
mustn't they be shuttering? 	mustn't I have shuttered?
mustn't you have shuttered?
mustn't he have shuttered?
mustn't we have shuttered?
mustn't you have shuttered?
mustn't they have shuttered? 	mustn't I have been shuttering?
mustn't you have been shuttering?
mustn't he have been shuttering?
mustn't we have been shuttering?
mustn't you have been shuttering?
mustn't they have been shuttering?