English verb conjugation
MUST DUET

Regular verb: duet - dueted - dueted

Affirmation

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