在早上在中午在晚上用英文表达：

in the morning 在早上；

at lunch 午餐时；

at noon 在中午；

in the evening 在傍晚；

at night 晚上

It was five o'clock in the morning.

那是在早上五点钟。

I want to make an early start in the morning.

我想早上早点出发。

There's a connecting flight at noon.

中午有一趟相衔接的航班。

She'll arrive in New York at noon.

她将在正午抵达纽约。

She doesn't like to walk home late at night.

她不喜欢深夜步行回家。

I don't like going out alone at night.

我不喜欢夜晚单独外出。