must duet
Verbo regular: duet - dueted- dueted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must duet
you must duet
he must duet
we must duet
you must duet
they must duet 	I must be dueting
you must be dueting
he must be dueting
we must be dueting
you must be dueting
they must be dueting	I must have dueted
you must have dueted
he must have dueted
we must have dueted
you must have dueted
they must have dueted	I must have been dueting
you must have been dueting
he must have been dueting
we must have been dueting
you must have been dueting
they must have been dueting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't duet
you mustn't duet
he mustn't duet
we mustn't duet
you mustn't duet
they mustn't duet 	I mustn't be dueting
you mustn't be dueting
he mustn't be dueting
we mustn't be dueting
you mustn't be dueting
they mustn't be dueting	I mustn't have dueted
you mustn't have dueted
he mustn't have dueted
we mustn't have dueted
you mustn't have dueted
they mustn't have dueted	I mustn't have been dueting
you mustn't have been dueting
he mustn't have been dueting
we mustn't have been dueting
you mustn't have been dueting
they mustn't have been dueting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I duet?
must you duet?
must he duet?
must we duet?
must you duet?
must they duet? 	must I be dueting?
must you be dueting?
must he be dueting?
must we be dueting?
must you be dueting?
must they be dueting? 	must I have dueted?
must you have dueted?
must he have dueted?
must we have dueted?
must you have dueted?
must they have dueted? 	must I have been dueting?
must you have been dueting?
must he have been dueting?
must we have been dueting?
must you have been dueting?
must they have been dueting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I duet?
mustn't you duet?
mustn't he duet?
mustn't we duet?
mustn't you duet?
mustn't they duet? 	mustn't I be dueting?
mustn't you be dueting?
mustn't he be dueting?
mustn't we be dueting?
mustn't you be dueting?
mustn't they be dueting? 	mustn't I have dueted?
mustn't you have dueted?
mustn't he have dueted?
mustn't we have dueted?
mustn't you have dueted?
mustn't they have dueted? 	mustn't I have been dueting?
mustn't you have been dueting?
mustn't he have been dueting?
mustn't we have been dueting?
mustn't you have been dueting?
mustn't they have been dueting?