开始上课用英语翻译为：Class begins。

例：

My class begins in january.

我们1月份开始上课。

The school made it a rule that the students should stand up when class begins.

学校定了一条规则，开始上课时学生要起立。

You should send him to class every morning and after the class begins, you can go to work.

你可以每天早上送他去学校，等他上课后你再去工作。

The teacher calls over the children's names before the class begins.

教师在上课前点名。