could duel
Verbo regular: duel - dueled- dueled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could duel
you could duel
she could duel
we could duel
you could duel
they could duel 	I could be dueling
you could be dueling
she could be dueling
we could be dueling
you could be dueling
they could be dueling	I could have dueled
you could have dueled
she could have dueled
we could have dueled
you could have dueled
they could have dueled	I could have been dueling
you could have been dueling
she could have been dueling
we could have been dueling
you could have been dueling
they could have been dueling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not duel
you could not duel
she could not duel
we could not duel
you could not duel
they could not duel 	I could not be dueling
you could not be dueling
she could not be dueling
we could not be dueling
you could not be dueling
they could not be dueling	I could not have dueled
you could not have dueled
she could not have dueled
we could not have dueled
you could not have dueled
they could not have dueled	I could not have been dueling
you could not have been dueling
she could not have been dueling
we could not have been dueling
you could not have been dueling
they could not have been dueling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I duel?
could you duel?
could she duel?
could we duel?
could you duel?
could they duel? 	could I be dueling?
could you be dueling?
could she be dueling?
could we be dueling?
could you be dueling?
could they be dueling? 	could I have dueled?
could you have dueled?
could she have dueled?
could we have dueled?
could you have dueled?
could they have dueled? 	could I have been dueling?
could you have been dueling?
could she have been dueling?
could we have been dueling?
could you have been dueling?
could they have been dueling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not duel?
could you not duel?
could she not duel?
could we not duel?
could you not duel?
could they not duel? 	could I not be dueling?
could you not be dueling?
could she not be dueling?
could we not be dueling?
could you not be dueling?
could they not be dueling? 	could I not have dueled?
could you not have dueled?
could she not have dueled?
could we not have dueled?
could you not have dueled?
could they not have dueled? 	could I not have been dueling?
could you not have been dueling?
could she not have been dueling?
could we not have been dueling?
could you not have been dueling?
could they not have been dueling?