We were in the same class at school.

我们在上学时同过班。

They are in the same class now.

他们现在在同一个班级。

So we are in the same class.

因此我们在同一个班。

We were both in the same class.

那时我们在同一个班。

They are all in the same class.

他们都在同一个班。