must overstrain
Verbe régulier : overstrain - overstrained- overstrained

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must overstrain
you must overstrain
he must overstrain
we must overstrain
you must overstrain
they must overstrain 	I must be overstraining
you must be overstraining
he must be overstraining
we must be overstraining
you must be overstraining
they must be overstraining	I must have overstrained
you must have overstrained
he must have overstrained
we must have overstrained
you must have overstrained
they must have overstrained	I must have been overstraining
you must have been overstraining
he must have been overstraining
we must have been overstraining
you must have been overstraining
they must have been overstraining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't overstrain
you mustn't overstrain
he mustn't overstrain
we mustn't overstrain
you mustn't overstrain
they mustn't overstrain 	I mustn't be overstraining
you mustn't be overstraining
he mustn't be overstraining
we mustn't be overstraining
you mustn't be overstraining
they mustn't be overstraining	I mustn't have overstrained
you mustn't have overstrained
he mustn't have overstrained
we mustn't have overstrained
you mustn't have overstrained
they mustn't have overstrained	I mustn't have been overstraining
you mustn't have been overstraining
he mustn't have been overstraining
we mustn't have been overstraining
you mustn't have been overstraining
they mustn't have been overstraining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I overstrain?
must you overstrain?
must he overstrain?
must we overstrain?
must you overstrain?
must they overstrain? 	must I be overstraining?
must you be overstraining?
must he be overstraining?
must we be overstraining?
must you be overstraining?
must they be overstraining? 	must I have overstrained?
must you have overstrained?
must he have overstrained?
must we have overstrained?
must you have overstrained?
must they have overstrained? 	must I have been overstraining?
must you have been overstraining?
must he have been overstraining?
must we have been overstraining?
must you have been overstraining?
must they have been overstraining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I overstrain?
mustn't you overstrain?
mustn't he overstrain?
mustn't we overstrain?
mustn't you overstrain?
mustn't they overstrain? 	mustn't I be overstraining?
mustn't you be overstraining?
mustn't he be overstraining?
mustn't we be overstraining?
mustn't you be overstraining?
mustn't they be overstraining? 	mustn't I have overstrained?
mustn't you have overstrained?
mustn't he have overstrained?
mustn't we have overstrained?
mustn't you have overstrained?
mustn't they have overstrained? 	mustn't I have been overstraining?
mustn't you have been overstraining?
mustn't he have been overstraining?
mustn't we have been overstraining?
mustn't you have been overstraining?
mustn't they have been overstraining?