can duel
Regular verb: duel - dueled- dueled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can duel
you can duel
she can duel
we can duel
you can duel
they can duel 	I can be dueling
you can be dueling
she can be dueling
we can be dueling
you can be dueling
they can be dueling	I can have dueled
you can have dueled
she can have dueled
we can have dueled
you can have dueled
they can have dueled	I can have been dueling
you can have been dueling
she can have been dueling
we can have been dueling
you can have been dueling
they can have been dueling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot duel
you cannot duel
she cannot duel
we cannot duel
you cannot duel
they cannot duel 	I cannot be dueling
you cannot be dueling
she cannot be dueling
we cannot be dueling
you cannot be dueling
they cannot be dueling	I cannot have dueled
you cannot have dueled
she cannot have dueled
we cannot have dueled
you cannot have dueled
they cannot have dueled	I cannot have been dueling
you cannot have been dueling
she cannot have been dueling
we cannot have been dueling
you cannot have been dueling
they cannot have been dueling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I duel?
can you duel?
can she duel?
can we duel?
can you duel?
can they duel? 	can I be dueling?
can you be dueling?
can she be dueling?
can we be dueling?
can you be dueling?
can they be dueling? 	can I have dueled?
can you have dueled?
can she have dueled?
can we have dueled?
can you have dueled?
can they have dueled? 	can I have been dueling?
can you have been dueling?
can she have been dueling?
can we have been dueling?
can you have been dueling?
can they have been dueling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not duel?
can you not duel?
can she not duel?
can we not duel?
can you not duel?
can they not duel? 	can I not be dueling?
can you not be dueling?
can she not be dueling?
can we not be dueling?
can you not be dueling?
can they not be dueling? 	can I not have dueled?
can you not have dueled?
can she not have dueled?
can we not have dueled?
can you not have dueled?
can they not have dueled? 	can I not have been dueling?
can you not have been dueling?
can she not have been dueling?
can we not have been dueling?
can you not have been dueling?
can they not have been dueling?