can fight
Irregular verb: fight - fought- fought

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I can't fight
you can't fight
she can't fight
we can't fight
you can't fight
they can't fight 	I can't be fighting
you can't be fighting
she can't be fighting
we can't be fighting
you can't be fighting
they can't be fighting	I can't have fought
you can't have fought
she can't have fought
we can't have fought
you can't have fought
they can't have fought	I can't have been fighting
you can't have been fighting
she can't have been fighting
we can't have been fighting
you can't have been fighting
they can't have been fighting	

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