must understudy
Verbe régulier : understudy - understudied- understudied
Traduction française : apprendre un rôle en tant que doublure - doubler 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must understudy
you must understudy
she must understudy
we must understudy
you must understudy
they must understudy 	I must be understudying
you must be understudying
she must be understudying
we must be understudying
you must be understudying
they must be understudying	I must have understudied
you must have understudied
she must have understudied
we must have understudied
you must have understudied
they must have understudied	I must have been understudying
you must have been understudying
she must have been understudying
we must have been understudying
you must have been understudying
they must have been understudying	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't understudy
you mustn't understudy
she mustn't understudy
we mustn't understudy
you mustn't understudy
they mustn't understudy 	I mustn't be understudying
you mustn't be understudying
she mustn't be understudying
we mustn't be understudying
you mustn't be understudying
they mustn't be understudying	I mustn't have understudied
you mustn't have understudied
she mustn't have understudied
we mustn't have understudied
you mustn't have understudied
they mustn't have understudied	I mustn't have been understudying
you mustn't have been understudying
she mustn't have been understudying
we mustn't have been understudying
you mustn't have been understudying
they mustn't have been understudying	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I understudy?
must you understudy?
must she understudy?
must we understudy?
must you understudy?
must they understudy? 	must I be understudying?
must you be understudying?
must she be understudying?
must we be understudying?
must you be understudying?
must they be understudying? 	must I have understudied?
must you have understudied?
must she have understudied?
must we have understudied?
must you have understudied?
must they have understudied? 	must I have been understudying?
must you have been understudying?
must she have been understudying?
must we have been understudying?
must you have been understudying?
must they have been understudying? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I understudy?
mustn't you understudy?
mustn't she understudy?
mustn't we understudy?
mustn't you understudy?
mustn't they understudy? 	mustn't I be understudying?
mustn't you be understudying?
mustn't she be understudying?
mustn't we be understudying?
mustn't you be understudying?
mustn't they be understudying? 	mustn't I have understudied?
mustn't you have understudied?
mustn't she have understudied?
mustn't we have understudied?
mustn't you have understudied?
mustn't they have understudied? 	mustn't I have been understudying?
mustn't you have been understudying?
mustn't she have been understudying?
mustn't we have been understudying?
mustn't you have been understudying?
mustn't they have been understudying?