Questions & Answers about היא סיפרה לי עליו, אבל אני לא מכירה אותו.
Because the subject is היא (she). In Hebrew past tense, the verb agrees with the subject in person, number, and gender.
- היא סיפרה = she told
- הוא סיפר = he told
So סיפרה is the correct 3rd person feminine singular past form of לספר.
Because מכירה is feminine singular, so it shows that the speaker is female.
In the present tense, Hebrew uses forms that agree with the subject's gender and number:
- female speaker: אני מכירה
- male speaker: אני מכיר
So this sentence is being said by a woman. If a man were speaking, it would be:
היא סיפרה לי עליו, אבל אני לא מכיר אותו.