English verb conjugation
MUST DUET

Regular verb: duet - dueted - dueted

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?