English verb conjugation
CAN FIGHT

Irregular verb: fight - fought - fought

Affirmation

Simple form	V-ing form
I can fight you can fight she can fight we can fight you can fight they can fight	I can be fighting you can be fighting she can be fighting we can be fighting you can be fighting they can be fighting
Perfect	V-ing perfect
I can have fought you can have fought she can have fought we can have fought you can have fought they can have fought	I can have been fighting you can have been fighting she can have been fighting we can have been fighting you can have been fighting they can have been fighting

Negation

Simple form	V-ing form
I cannot fight you cannot fight she cannot fight we cannot fight you cannot fight they cannot fight	I cannot be fighting you cannot be fighting she cannot be fighting we cannot be fighting you cannot be fighting they cannot be fighting
Perfect	V-ing perfect
I cannot have fought you cannot have fought she cannot have fought we cannot have fought you cannot have fought they cannot have fought	I cannot have been fighting you cannot have been fighting she cannot have been fighting we cannot have been fighting you cannot have been fighting they cannot have been fighting

Interrogative form

Simple form	V-ing form
can I fight? can you fight? can she fight? can we fight? can you fight? can they fight?	can I be fighting? can you be fighting? can she be fighting? can we be fighting? can you be fighting? can they be fighting?
Perfect	V-ing perfect
can I have fought? can you have fought? can she have fought? can we have fought? can you have fought? can they have fought?	can I have been fighting? can you have been fighting? can she have been fighting? can we have been fighting? can you have been fighting? can they have been fighting?

Interro-negative form

Simple form	V-ing form
can I not fight? can you not fight? can she not fight? can we not fight? can you not fight? can they not fight?	can I not be fighting? can you not be fighting? can she not be fighting? can we not be fighting? can you not be fighting? can they not be fighting?
Perfect	V-ing perfect
can I not have fought? can you not have fought? can she not have fought? can we not have fought? can you not have fought? can they not have fought?	can I not have been fighting? can you not have been fighting? can she not have been fighting? can we not have been fighting? can you not have been fighting? can they not have been fighting?