او

او

"He" or "she" (third-person singular pronoun).

In this sentence, 'او' refers to an unspecified third person subject (he or she) performing the action.

او کتابی خرید.

He/she bought a book.

Here, 'او' acts as the object of the sentence, receiving the action.

من به او کمک کردم.

I helped him/her.

In this example, 'او' is used as the subject identifying the third person performing the action.

او به مدرسه رفت.

He/she went to school.