Conjugation of the verb "to fight:"

I/You/We/They:
fight (present)
fought (past)
will fight
have fought
had fought
would have fought
used to fight
might fight

He/She:
fights
fought
will fight
has fought
had fought
would have fought
used to fight
might fight

If you want to say "is fighting," All you have to change is the "to be" verb. Like so:
I am fighting
She is fighting
We are fighting
You were fighting, but you quit.
etc.