must improvise
Verbe régulier : improvise - improvised- improvised
Traduction française : improviser 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must improvise
you must improvise
he must improvise
we must improvise
you must improvise
they must improvise 	I must be improvising
you must be improvising
he must be improvising
we must be improvising
you must be improvising
they must be improvising	I must have improvised
you must have improvised
he must have improvised
we must have improvised
you must have improvised
they must have improvised	I must have been improvising
you must have been improvising
he must have been improvising
we must have been improvising
you must have been improvising
they must have been improvising	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't improvise
you mustn't improvise
he mustn't improvise
we mustn't improvise
you mustn't improvise
they mustn't improvise 	I mustn't be improvising
you mustn't be improvising
he mustn't be improvising
we mustn't be improvising
you mustn't be improvising
they mustn't be improvising	I mustn't have improvised
you mustn't have improvised
he mustn't have improvised
we mustn't have improvised
you mustn't have improvised
they mustn't have improvised	I mustn't have been improvising
you mustn't have been improvising
he mustn't have been improvising
we mustn't have been improvising
you mustn't have been improvising
they mustn't have been improvising	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I improvise?
must you improvise?
must he improvise?
must we improvise?
must you improvise?
must they improvise? 	must I be improvising?
must you be improvising?
must he be improvising?
must we be improvising?
must you be improvising?
must they be improvising? 	must I have improvised?
must you have improvised?
must he have improvised?
must we have improvised?
must you have improvised?
must they have improvised? 	must I have been improvising?
must you have been improvising?
must he have been improvising?
must we have been improvising?
must you have been improvising?
must they have been improvising? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I improvise?
mustn't you improvise?
mustn't he improvise?
mustn't we improvise?
mustn't you improvise?
mustn't they improvise? 	mustn't I be improvising?
mustn't you be improvising?
mustn't he be improvising?
mustn't we be improvising?
mustn't you be improvising?
mustn't they be improvising? 	mustn't I have improvised?
mustn't you have improvised?
mustn't he have improvised?
mustn't we have improvised?
mustn't you have improvised?
mustn't they have improvised? 	mustn't I have been improvising?
mustn't you have been improvising?
mustn't he have been improvising?
mustn't we have been improvising?
mustn't you have been improvising?
mustn't they have been improvising?