English verb conjugation
COULD DUET

Regular verb: duet - dueted - dueted

Affirmation

Simple form	V-ing form
I could duet you could duet he could duet we could duet you could duet they could duet	I could be dueting you could be dueting he could be dueting we could be dueting you could be dueting they could be dueting
Perfect	V-ing perfect
I could have dueted you could have dueted he could have dueted we could have dueted you could have dueted they could have dueted	I could have been dueting you could have been dueting he could have been dueting we could have been dueting you could have been dueting they could have been dueting

Negation

Simple form	V-ing form
I could not duet you could not duet he could not duet we could not duet you could not duet they could not duet	I could not be dueting you could not be dueting he could not be dueting we could not be dueting you could not be dueting they could not be dueting
Perfect	V-ing perfect
I could not have dueted you could not have dueted he could not have dueted we could not have dueted you could not have dueted they could not have dueted	I could not have been dueting you could not have been dueting he could not have been dueting we could not have been dueting you could not have been dueting they could not have been dueting

Interrogative form

Simple form	V-ing form
could I duet? could you duet? could he duet? could we duet? could you duet? could they duet?	could I be dueting? could you be dueting? could he be dueting? could we be dueting? could you be dueting? could they be dueting?
Perfect	V-ing perfect
could I have dueted? could you have dueted? could he have dueted? could we have dueted? could you have dueted? could they have dueted?	could I have been dueting? could you have been dueting? could he have been dueting? could we have been dueting? could you have been dueting? could they have been dueting?

Interro-negative form

Simple form	V-ing form
could I not duet? could you not duet? could he not duet? could we not duet? could you not duet? could they not duet?	could I not be dueting? could you not be dueting? could he not be dueting? could we not be dueting? could you not be dueting? could they not be dueting?
Perfect	V-ing perfect
could I not have dueted? could you not have dueted? could he not have dueted? could we not have dueted? could you not have dueted? could they not have dueted?	could I not have been dueting? could you not have been dueting? could he not have been dueting? could we not have been dueting? could you not have been dueting? could they not have been dueting?