Breakdown of היא הבטיחה לבדוק את המסמך עוד פעם, ואחרי זה גילתה שאין חתימה על המסמך.
Questions & Answers about היא הבטיחה לבדוק את המסמך עוד פעם, ואחרי זה גילתה שאין חתימה על המסמך.
Because the subject is היא = she, and in Hebrew the verb agrees with the subject in gender and number.
- הבטיחה = she promised
- גילתה = she discovered
These are both past tense, 3rd person, feminine singular forms.
If the subject were he, you would get:
- הוא הבטיח
- הוא גילה
So the final ־ה here is part of the feminine singular past-tense form.
After הבטיחה (promised), Hebrew normally uses an infinitive for the action that was promised.
- לבדוק = to check
So:
- הבטיחה לבדוק = promised to check
This works very much like English promised to check.
The ל־ at the start of לבדוק is the normal marker of the infinitive in Hebrew.