must strain
Verbe régulier : strain - strained- strained
Traduction française : tendre (fortement) - tirer fort 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must strain
you must strain
she must strain
we must strain
you must strain
they must strain 	I must be straining
you must be straining
she must be straining
we must be straining
you must be straining
they must be straining	I must have strained
you must have strained
she must have strained
we must have strained
you must have strained
they must have strained	I must have been straining
you must have been straining
she must have been straining
we must have been straining
you must have been straining
they must have been straining	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't strain
you mustn't strain
she mustn't strain
we mustn't strain
you mustn't strain
they mustn't strain 	I mustn't be straining
you mustn't be straining
she mustn't be straining
we mustn't be straining
you mustn't be straining
they mustn't be straining	I mustn't have strained
you mustn't have strained
she mustn't have strained
we mustn't have strained
you mustn't have strained
they mustn't have strained	I mustn't have been straining
you mustn't have been straining
she mustn't have been straining
we mustn't have been straining
you mustn't have been straining
they mustn't have been straining	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I strain?
must you strain?
must she strain?
must we strain?
must you strain?
must they strain? 	must I be straining?
must you be straining?
must she be straining?
must we be straining?
must you be straining?
must they be straining? 	must I have strained?
must you have strained?
must she have strained?
must we have strained?
must you have strained?
must they have strained? 	must I have been straining?
must you have been straining?
must she have been straining?
must we have been straining?
must you have been straining?
must they have been straining? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I strain?
mustn't you strain?
mustn't she strain?
mustn't we strain?
mustn't you strain?
mustn't they strain? 	mustn't I be straining?
mustn't you be straining?
mustn't she be straining?
mustn't we be straining?
mustn't you be straining?
mustn't they be straining? 	mustn't I have strained?
mustn't you have strained?
mustn't she have strained?
mustn't we have strained?
mustn't you have strained?
mustn't they have strained? 	mustn't I have been straining?
mustn't you have been straining?
mustn't she have been straining?
mustn't we have been straining?
mustn't you have been straining?
mustn't they have been straining?