Mr Wu is our form teacher.

吴老师是我们的班主任。

Mr Wu is also the form teacher of Class 1, Grade 7.

吴老师也是七年级一班的班主任。

Our form teacher sadly announced that you had got cancer.

我们年级的老师宣布你得了癌症。

So you were like a form teacher, teaching the whole range of subjects.

所以以前你是个级任教师，教所有的科目。