at night習慣上的固定搭配，側重于晚上，只能是“在夜里/間”，比in the evening 稍微要遲一些。 in the evening,比較側重于傍晚那段時間，可以指“在黃昏”,in the evening可用于一般將來時或一般現在時，at night可用于一般過去時。

in the evening的用法舉例

in the evening是“在傍晚、晚上”，表示的在當天或者在某一天的晚上，用于一般將來時或一般現在時。

例句：My mother needs me by her side in the evening.我母親晚上需要我陪在她身邊。

Do you always go out for a walk in the evening?你晚上總去散步嗎？

Supper is from 5.00 to 6.00 in the evening.晚餐在傍晚5點到6點之間。

He finishes his homework at eight o'clock in the evening.他在晚上8點完成作業(yè)。

They worked without a break until about nine in the evening. 他們一刻不停地干到晚上九點鐘左右。

In the evening the general manager gave a banquet at the international hotel in honour of the foreign guests.當晚總經理設座國際飯店宴請外賓。

in the evening不具體的晚上，可用作可數名詞，也可用作不可數名詞。

I will go to the cinema with my sister in the evening. 我晚上會和姐姐去電影院。

I go to the cinema with my sister in the evenings. 我每個晚上會和姐姐去電影院。

at night用法舉例

at night指夜晚，通常表泛指，可用于一般現在時，還可用于一般過去時。

例句：Thieves broke into my home at night.小偷晚上闖進了我家。

I don't watch Tv late at night.我深夜不看電視。

It was late at night and Mary was still working away at his homework.夜深了，瑪麗還在做課外作業(yè)。

I had to work late at night.我不得不深夜工作。

I don't finsh my homework late at night. 我深夜不完成作業(yè)。