不要在图书馆里大声说话。

Don't speak loudly in the library.

你不可以在图书馆大声说话。

You may not speak loudly in the library.

请不要在图书馆大声说话。

Please do not speak loudly in the library.

你不可在图书馆大声说话。

You should not speak loudly in the library.

在公共场合大声说话是没礼貌的。

It is impolite to speak loudly in public.

当你在户外时，你可以大声说话。

You can speak loudly when you are outdoors.

在公共场合大声说话是粗鲁的行为。

It is rude to speak loudly in public.

老师要求我们在课堂上不要大声说话。

The teacher asked us not to speak loudly in class.

我今天嗓子痛，所以不能大声说话。

I have a sore throat today, so I can't speak loudly.

当我们大声说话。

When we speak loudly.