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
he must understudy
we must understudy
you must understudy
they must understudy 	I must be understudying
you must be understudying
he must be understudying
we must be understudying
you must be understudying
they must be understudying	I must have understudied
you must have understudied
he 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
he 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 must not understudy
you must not understudy
he must not understudy
we must not understudy
you must not understudy
they must not understudy 	I must not be understudying
you must not be understudying
he must not be understudying
we must not be understudying
you must not be understudying
they must not be understudying	I must not have understudied
you must not have understudied
he must not have understudied
we must not have understudied
you must not have understudied
they must not have understudied	I must not have been understudying
you must not have been understudying
he must not have been understudying
we must not have been understudying
you must not have been understudying
they must not have been understudying	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I understudy?
must you understudy?
must he understudy?
must we understudy?
must you understudy?
must they understudy? 	must I be understudying?
must you be understudying?
must he be understudying?
must we be understudying?
must you be understudying?
must they be understudying? 	must I have understudied?
must you have understudied?
must he 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 he 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 	
must I not understudy?
must you not understudy?
must he not understudy?
must we not understudy?
must you not understudy?
must they not understudy? 	must I not be understudying?
must you not be understudying?
must he not be understudying?
must we not be understudying?
must you not be understudying?
must they not be understudying? 	must I not have understudied?
must you not have understudied?
must he not have understudied?
must we not have understudied?
must you not have understudied?
must they not have understudied? 	must I not have been understudying?
must you not have been understudying?
must he not have been understudying?
must we not have been understudying?
must you not have been understudying?
must they not have been understudying?