must constrain
Verbo regular: constrain - constrained- constrained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must constrain
you must constrain
he must constrain
we must constrain
you must constrain
they must constrain 	I must be constraining
you must be constraining
he must be constraining
we must be constraining
you must be constraining
they must be constraining	I must have constrained
you must have constrained
he must have constrained
we must have constrained
you must have constrained
they must have constrained	I must have been constraining
you must have been constraining
he must have been constraining
we must have been constraining
you must have been constraining
they must have been constraining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not constrain
you must not constrain
he must not constrain
we must not constrain
you must not constrain
they must not constrain 	I must not be constraining
you must not be constraining
he must not be constraining
we must not be constraining
you must not be constraining
they must not be constraining	I must not have constrained
you must not have constrained
he must not have constrained
we must not have constrained
you must not have constrained
they must not have constrained	I must not have been constraining
you must not have been constraining
he must not have been constraining
we must not have been constraining
you must not have been constraining
they must not have been constraining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I constrain?
must you constrain?
must he constrain?
must we constrain?
must you constrain?
must they constrain? 	must I be constraining?
must you be constraining?
must he be constraining?
must we be constraining?
must you be constraining?
must they be constraining? 	must I have constrained?
must you have constrained?
must he have constrained?
must we have constrained?
must you have constrained?
must they have constrained? 	must I have been constraining?
must you have been constraining?
must he have been constraining?
must we have been constraining?
must you have been constraining?
must they have been constraining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not constrain?
must you not constrain?
must he not constrain?
must we not constrain?
must you not constrain?
must they not constrain? 	must I not be constraining?
must you not be constraining?
must he not be constraining?
must we not be constraining?
must you not be constraining?
must they not be constraining? 	must I not have constrained?
must you not have constrained?
must he not have constrained?
must we not have constrained?
must you not have constrained?
must they not have constrained? 	must I not have been constraining?
must you not have been constraining?
must he not have been constraining?
must we not have been constraining?
must you not have been constraining?
must they not have been constraining?