must listen
Verbo regular: listen - listened- listened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must listen
you must listen
she must listen
we must listen
you must listen
they must listen 	I must be listening
you must be listening
she must be listening
we must be listening
you must be listening
they must be listening	I must have listened
you must have listened
she must have listened
we must have listened
you must have listened
they must have listened	I must have been listening
you must have been listening
she must have been listening
we must have been listening
you must have been listening
they must have been listening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't listen
you mustn't listen
she mustn't listen
we mustn't listen
you mustn't listen
they mustn't listen 	I mustn't be listening
you mustn't be listening
she mustn't be listening
we mustn't be listening
you mustn't be listening
they mustn't be listening	I mustn't have listened
you mustn't have listened
she mustn't have listened
we mustn't have listened
you mustn't have listened
they mustn't have listened	I mustn't have been listening
you mustn't have been listening
she mustn't have been listening
we mustn't have been listening
you mustn't have been listening
they mustn't have been listening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I listen?
must you listen?
must she listen?
must we listen?
must you listen?
must they listen? 	must I be listening?
must you be listening?
must she be listening?
must we be listening?
must you be listening?
must they be listening? 	must I have listened?
must you have listened?
must she have listened?
must we have listened?
must you have listened?
must they have listened? 	must I have been listening?
must you have been listening?
must she have been listening?
must we have been listening?
must you have been listening?
must they have been listening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I listen?
mustn't you listen?
mustn't she listen?
mustn't we listen?
mustn't you listen?
mustn't they listen? 	mustn't I be listening?
mustn't you be listening?
mustn't she be listening?
mustn't we be listening?
mustn't you be listening?
mustn't they be listening? 	mustn't I have listened?
mustn't you have listened?
mustn't she have listened?
mustn't we have listened?
mustn't you have listened?
mustn't they have listened? 	mustn't I have been listening?
mustn't you have been listening?
mustn't she have been listening?
mustn't we have been listening?
mustn't you have been listening?
mustn't they have been listening?