must act
Verbe régulier : act - acted- acted
Traduction française : agir - jouer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must act
you must act
she must act
we must act
you must act
they must act 	I must be acting
you must be acting
she must be acting
we must be acting
you must be acting
they must be acting	I must have acted
you must have acted
she must have acted
we must have acted
you must have acted
they must have acted	I must have been acting
you must have been acting
she must have been acting
we must have been acting
you must have been acting
they must have been acting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not act
you must not act
she must not act
we must not act
you must not act
they must not act 	I must not be acting
you must not be acting
she must not be acting
we must not be acting
you must not be acting
they must not be acting	I must not have acted
you must not have acted
she must not have acted
we must not have acted
you must not have acted
they must not have acted	I must not have been acting
you must not have been acting
she must not have been acting
we must not have been acting
you must not have been acting
they must not have been acting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I act?
must you act?
must she act?
must we act?
must you act?
must they act? 	must I be acting?
must you be acting?
must she be acting?
must we be acting?
must you be acting?
must they be acting? 	must I have acted?
must you have acted?
must she have acted?
must we have acted?
must you have acted?
must they have acted? 	must I have been acting?
must you have been acting?
must she have been acting?
must we have been acting?
must you have been acting?
must they have been acting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not act?
must you not act?
must she not act?
must we not act?
must you not act?
must they not act? 	must I not be acting?
must you not be acting?
must she not be acting?
must we not be acting?
must you not be acting?
must they not be acting? 	must I not have acted?
must you not have acted?
must she not have acted?
must we not have acted?
must you not have acted?
must they not have acted? 	must I not have been acting?
must you not have been acting?
must she not have been acting?
must we not have been acting?
must you not have been acting?
must they not have been acting?