Translation:She is looking for a boy.
What indicates she in this sentence?
The 3rd person singular is indicated by the form of the verb, but it could be he, she, or it in English.
Should this be 'Egy fiut keres' or the 'egy' isn't required?
The indefinite article isn't necessary in Hungarian.
Why not "she looks for a boy? "
That is also good.
Okay, what is the form that indicates he/she/it?
"keres" - I am looking for = "keresek", you are looking for = "kesesel". The third person singular (for indefinite present) is the form with no ending.