每天都要经历的"日"和"夜"与惯用语的关系也很密切，下列例句足以为证：

(1)All night long: 整夜

Some stores stay open all night long.

(2)Call it a day: 一天工作完毕

Every day, we have class from 9am and will call it a day at 4.30pm.

(3)Day after day: 每天

Schooling could be very boring, as the students do the same things day after day.

(4)Day in day out: 一天又一天

Henry wears the same old jeans day in day out. Isn't he going to buy some new clothes ?

(5)For a rainy day: 为困难的日子作准备

When a person gets older, he will realise the importance of saving for a rainy day.

(6)In this day and age: 在现在这时代

In this day and age, no one can expect to get something out of nothing.

(7)Have an off day: 不大成功或顺利的一天

Tom did not do well in yesterday's test.He considered him unlucky euough to have an off day.

(8)The order of the day: 一般的惯例

In a petroleum station here, payment by credit card is the order of the day.

(9)The other day: 几天前

I bumped into an old friend the other day.

(10)To this day: （指日期）准确地

It is 40 years to this day that I left university.

(11)Have seen better days: 曾经历过好日子

Palmer was departmental head in that university before he came here. He has seen better days.

(12)Some day: 将来

Everyone hopes to be great some day.

(13)One's days are numbered: 末日将临：

Under computerisation, unskilled workers become redundant. Their days in a company are numbered.

(14)Carry the day: 胜利的一天

Our team lost at first, but later, it carried the day with two goals to one.

(15)Someone's day: 幸运的一天

Jim was promoted. Furthermore, he was given a performance bonus yesterday. It was his day.

(16)Take a day off: 休息一天

Janet was unwell and took a day off.

(17)Have a night out: 夜间出去消遣

It's time to have a change. We must have a night out at the weekend.

(18)A night owl: 迟迟不睡者

The moment Jack entered the university, he was a night owl.

(19)At the dead of night: 深夜

Our managerial officers attended the emergency meeting at the dead ofnight.

(20) Save the day: 使情况变佳.

Frank saved the day by kicking in a goal during the last five minutes of the match.

(21)Every dog has its day: 凡人都有得意日

I have seen ordinary people suddenly become important. This is a case of every dog has its day.

(22)What is done by night appears by day: 若要人不知，除非己莫为

"Crime does not pay. Criminals will be found out. That's why we say : What is done by night appears by day.