must duet
Regular verb: duet - dueted- dueted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must duet
you must duet
she must duet
we must duet
you must duet
they must duet 	I must be dueting
you must be dueting
she must be dueting
we must be dueting
you must be dueting
they must be dueting	I must have dueted
you must have dueted
she 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
she must have been dueting
we must have been dueting
you must have been dueting
they must have been dueting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't duet
you mustn't duet
she 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
she 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
she 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
she mustn't have been dueting
we mustn't have been dueting
you mustn't have been dueting
they mustn't have been dueting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I duet?
must you duet?
must she duet?
must we duet?
must you duet?
must they duet? 	must I be dueting?
must you be dueting?
must she be dueting?
must we be dueting?
must you be dueting?
must they be dueting? 	must I have dueted?
must you have dueted?
must she 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 she have been dueting?
must we have been dueting?
must you have been dueting?
must they have been dueting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I duet?
mustn't you duet?
mustn't she 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 she 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 she 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 she have been dueting?
mustn't we have been dueting?
mustn't you have been dueting?
mustn't they have been dueting?