must skirr
Verbe régulier : skirr - skirred- skirred

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must skirr
you must skirr
she must skirr
we must skirr
you must skirr
they must skirr 	I must be skirring
you must be skirring
she must be skirring
we must be skirring
you must be skirring
they must be skirring	I must have skirred
you must have skirred
she must have skirred
we must have skirred
you must have skirred
they must have skirred	I must have been skirring
you must have been skirring
she must have been skirring
we must have been skirring
you must have been skirring
they must have been skirring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't skirr
you mustn't skirr
she mustn't skirr
we mustn't skirr
you mustn't skirr
they mustn't skirr 	I mustn't be skirring
you mustn't be skirring
she mustn't be skirring
we mustn't be skirring
you mustn't be skirring
they mustn't be skirring	I mustn't have skirred
you mustn't have skirred
she mustn't have skirred
we mustn't have skirred
you mustn't have skirred
they mustn't have skirred	I mustn't have been skirring
you mustn't have been skirring
she mustn't have been skirring
we mustn't have been skirring
you mustn't have been skirring
they mustn't have been skirring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I skirr?
must you skirr?
must she skirr?
must we skirr?
must you skirr?
must they skirr? 	must I be skirring?
must you be skirring?
must she be skirring?
must we be skirring?
must you be skirring?
must they be skirring? 	must I have skirred?
must you have skirred?
must she have skirred?
must we have skirred?
must you have skirred?
must they have skirred? 	must I have been skirring?
must you have been skirring?
must she have been skirring?
must we have been skirring?
must you have been skirring?
must they have been skirring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I skirr?
mustn't you skirr?
mustn't she skirr?
mustn't we skirr?
mustn't you skirr?
mustn't they skirr? 	mustn't I be skirring?
mustn't you be skirring?
mustn't she be skirring?
mustn't we be skirring?
mustn't you be skirring?
mustn't they be skirring? 	mustn't I have skirred?
mustn't you have skirred?
mustn't she have skirred?
mustn't we have skirred?
mustn't you have skirred?
mustn't they have skirred? 	mustn't I have been skirring?
mustn't you have been skirring?
mustn't she have been skirring?
mustn't we have been skirring?
mustn't you have been skirring?
mustn't they have been skirring?