At eight thirty at night.

晚上八点半。

I have art at eight o'clock.

我八点有美术课。

School starts at eight o'clock.

学校八点钟开始。

At eight thirty in the morning.

早上八点半。

I go to school at eight o'clock.

我八点钟去上学。

We have Chinese at eight o'clock.

我们八点上语文课。

In the morning, I get up at eight.

早上，我八点起床。

Then I go to school at eight thirty.

然后我八点半去上学。

What were you doing at eight last night?

昨晚八点你在做什么？

At eight o'clock last night I was sleeping.

昨晚八点我在睡觉。