Let's not talk loudly in class.

我们不要在课堂上大声喧哗了。

youdao

Don't talk loudly in class.

不要在课堂上大声讲话。

youdao

Now I want to say something about our class rules. First you can't eat in class. In class, you can't talk freely or loudly; you can't sleep or drink, either.

我想说一下我们班规，第一，你们不能在上课时吃东西，上课时，你们不能自由或大声地讲话，也不能睡觉和喝东西。

youdao

Now I want to say something about our class rules. First you can't eat in class. In class, you can't talk freely or loudly; you can't sleep or drink, either.

我想说一下我们班规，第一，你们不能在上课时吃东西，上课时，你们不能自由或大声地讲话，也不能睡觉和喝东西。

youdao