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 mustn't contain
you mustn't contain
he mustn't contain
we mustn't contain
you mustn't contain
they mustn't contain 	I mustn't be containing
you mustn't be containing
he mustn't be containing
we mustn't be containing
you mustn't be containing
they mustn't be containing	I mustn't have contained
you mustn't have contained
he mustn't have contained
we mustn't have contained
you mustn't have contained
they mustn't have contained	I mustn't have been containing
you mustn't have been containing
he mustn't have been containing
we mustn't have been containing
you mustn't have been containing
they mustn't 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 	
mustn't I contain?
mustn't you contain?
mustn't he contain?
mustn't we contain?
mustn't you contain?
mustn't they contain? 	mustn't I be containing?
mustn't you be containing?
mustn't he be containing?
mustn't we be containing?
mustn't you be containing?
mustn't they be containing? 	mustn't I have contained?
mustn't you have contained?
mustn't he have contained?
mustn't we have contained?
mustn't you have contained?
mustn't they have contained? 	mustn't I have been containing?
mustn't you have been containing?
mustn't he have been containing?
mustn't we have been containing?
mustn't you have been containing?
mustn't they have been containing?