Writing prompt: Should Students Be Allowed to Use Cellphones at School?

Student essay:
Nowadays, a number of students use cellphones at the school. The problem is whether we should allow students to use mobile phones at school.
As the say goes, every coin has two sides. Some students believe that phones bring us some convenience. It is convenient to contact with families and friends. Besides, when we are boring, we can use it to watch movies, play games, take photos and so on. In a word, it is very useful.
However, others hold the view that it has no goods. They think we can be addicted to the phones. It is bad for our eyes. Furthermore, if we spend too much time on it, our grades will fall behind.
In my opinion, cellphones make our life convenient and colorful. We should use it at the school. But we mustn't use it at class. It is wonderful for us, if we use it right.

Corrected essay:
Nowadays, a number of students use cellphones at school. The problem is whether we should allow students to use mobile phones at school.
As the saying goes, every coin has two sides. Some students believe that phones bring us some convenience. It is convenient to contact families and friends. Besides, when we are bored, we can use them to watch movies, play games, take photos, and so on. In a word, they are very useful.
However, others hold the view that they have no benefits. They think we can be addicted to phones. It is bad for our eyes. Furthermore, if we spend too much time on them, our grades will fall behind.
In my opinion, cellphones make our life convenient and colorful. We should use them at school. But we mustn't use them in class. It is wonderful for us if we use them right.