请在八点钟之前到达。

Please arrive before eight o'clock.

会议将在八点钟准时开始。

The meeting will start promptly at eight o'clock.

是在八点钟他到的家。

I was 8 0' cock when he arrived home.

书记说，谈话将在八点钟开始。

The secretary said that the talk would begin at eight o'clock.

如果你方便的话，请在八点钟来。

If it is convenient to you, please call at eight o'clock.

约翰本来要在八点钟来这儿，但他迟到了。

John was supposed to be here at eight o'clock, but he's late.