must contain
Verbo regular: contain - contained- contained

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must contain
you must contain
he must contain
we must contain
you must contain
they must contain 	I must be containing
you must be containing
he must be containing
we must be containing
you must be containing
they must be containing	I must have contained
you must have contained
he must have contained
we must have contained
you must have contained
they must have contained	I must have been containing
you must have been containing
he must have been containing
we must have been containing
you must have been containing
they must have been containing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not contain
you must not contain
he must not contain
we must not contain
you must not contain
they must not contain 	I must not be containing
you must not be containing
he must not be containing
we must not be containing
you must not be containing
they must not be containing	I must not have contained
you must not have contained
he must not have contained
we must not have contained
you must not have contained
they must not have contained	I must not have been containing
you must not have been containing
he must not have been containing
we must not have been containing
you must not have been containing
they must not have been containing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I contain?
must you contain?
must he contain?
must we contain?
must you contain?
must they contain? 	must I be containing?
must you be containing?
must he be containing?
must we be containing?
must you be containing?
must they be containing? 	must I have contained?
must you have contained?
must he have contained?
must we have contained?
must you have contained?
must they have contained? 	must I have been containing?
must you have been containing?
must he have been containing?
must we have been containing?
must you have been containing?
must they have been containing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not contain?
must you not contain?
must he not contain?
must we not contain?
must you not contain?
must they not contain? 	must I not be containing?
must you not be containing?
must he not be containing?
must we not be containing?
must you not be containing?
must they not be containing? 	must I not have contained?
must you not have contained?
must he not have contained?
must we not have contained?
must you not have contained?
must they not have contained? 	must I not have been containing?
must you not have been containing?
must he not have been containing?
must we not have been containing?
must you not have been containing?
must they not have been containing?