He’s quiet as a mouse in class.

上的时候他总是悄没声儿的。

I have to go now because I must be punctual for class.

现在不不走了, 因为时去上。

He often reviews today's lessons for tomorrow.

他常为明天上复习今天的功。

I'm constantly having to mug up things ahead of teaching them.

经常不不在上前攻读要讲的东西。

The teacher took attendance at the beginning of every class.

每次一上老师都要点名。

The late boy made a beeline for his classroom.

迟的男孩抄捷径跑去上。

The children were taught individually, not in a group.

孩子们被个别教授，不是一起上。

I will inquire when to begin our lessons.

要去问一下们什么时候开始上。

Tom did play hookey, and he had a very good time.

汤姆真的没去上，痛痛快快地玩了一场。

I made the zip gun in class out of a toy airplane launcher.

在上时用玩具飞机发射器改制成了这把枪。

I was late for a class.

上迟了。

He fell asleep during the lesson.

他在上时睡着了。

Topsy had an uncommon verbal memory, and committed with a fluency that greatly encouraged her instructress.

托普西对文字的记忆力非常强，上时对答如流，使她的教师感十分鼓舞。

The bell sounded for the beginning of the lesson, and, right on cue, the teacher walked in.

上铃响了，就在这时候老师走了进来。

It's time for class.

上时间了。