A Hundred and One Rules in Arabic Grammar!
- Interrogative Particles أ / هل (revisited). =================================================
The Arabic language does not tolerate the use of هل with any form of ليسَ in order to make a question. You have to stick with أ
**أليسَ الطالبُ في المکتبةِ؟**
Isn't the student (m) in the library?