You mustn't make faces in class.

上课不要做鬼脸，出洋相。

youdao

Don't make faces in class.

不要在课堂上做鬼脸。

youdao

Don't make faces in class next time.

下次不要在课堂上做鬼脸。

youdao

He doesn't make faces in class any more.

课堂上他不再做鬼脸了。

youdao

The teacher told him not to make faces in class.

老师告诉他不要在上课时做鬼脸。

youdao

The teacher told him not to make faces in class.

老师告诉他不要在上课时做鬼脸。

youdao