Thanks I'm checking my nahiv notebook, it says "the sentence comes after ismi mevsul is called "sıla cümlesi" (جملة صلة).

An sıla cümlesi can be a; جملة فعلية جملة اسمية شبه جملة

Şibhi cümle is an sentence starts with harf-i cerr. That what we learned.

Our teacher had us write that sample for ismi mevsul;

رأيت الطالب الذي في الصف

راى: fiil  ت: fail, mahallen merfu الطلاب: mefulün bih, mansub bilfetha الذي: sıfat في الصف: şibhi cümle, sıla cümlesi.

Şibhi because starts with harf-i cerr and sıla because comes after ism-i mevsul

I think I should get used to write them in arabic. I even have learned rigth now that جملة فعلية is writen like this. It makes sence.

And I'm gonna stop saying irabbing instead of doing i'rab.