could duet
Verbo regular: duet - dueted- dueted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't duet
you couldn't duet
he couldn't duet
we couldn't duet
you couldn't duet
they couldn't duet 	I couldn't be dueting
you couldn't be dueting
he couldn't be dueting
we couldn't be dueting
you couldn't be dueting
they couldn't be dueting	I couldn't have dueted
you couldn't have dueted
he couldn't have dueted
we couldn't have dueted
you couldn't have dueted
they couldn't have dueted	I couldn't have been dueting
you couldn't have been dueting
he couldn't have been dueting
we couldn't have been dueting
you couldn't have been dueting
they couldn't have been dueting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I duet?
couldn't you duet?
couldn't he duet?
couldn't we duet?
couldn't you duet?
couldn't they duet? 	couldn't I be dueting?
couldn't you be dueting?
couldn't he be dueting?
couldn't we be dueting?
couldn't you be dueting?
couldn't they be dueting? 	couldn't I have dueted?
couldn't you have dueted?
couldn't he have dueted?
couldn't we have dueted?
couldn't you have dueted?
couldn't they have dueted? 	couldn't I have been dueting?
couldn't you have been dueting?
couldn't he have been dueting?
couldn't we have been dueting?
couldn't you have been dueting?
couldn't they have been dueting?