must strain
Verbo regular: strain - strained- strained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must strain
you must strain
he must strain
we must strain
you must strain
they must strain 	I must be straining
you must be straining
he must be straining
we must be straining
you must be straining
they must be straining	I must have strained
you must have strained
he 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
he must have been straining
we must have been straining
you must have been straining
they must have been straining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't strain
you mustn't strain
he 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
he 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
he 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
he mustn't have been straining
we mustn't have been straining
you mustn't have been straining
they mustn't have been straining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I strain?
must you strain?
must he strain?
must we strain?
must you strain?
must they strain? 	must I be straining?
must you be straining?
must he be straining?
must we be straining?
must you be straining?
must they be straining? 	must I have strained?
must you have strained?
must he 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 he have been straining?
must we have been straining?
must you have been straining?
must they have been straining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I strain?
mustn't you strain?
mustn't he 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 he 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 he 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 he have been straining?
mustn't we have been straining?
mustn't you have been straining?
mustn't they have been straining?