Find the mistake

[abdoatty]

الإجابة هى
He is used to sleeping early since he was young
I fell ill while I was on holiday
She studies hard because she wants to get high marks
Nourhan is the most intelligent student in the class
They look so tired ; so they have been playing Squash for three hours
هذة الإجابة طبقا لما جاء فى نموذج الإجابة الذى صححنا منه.
بالتوفيق أن شاء الله للجميع