解放军文职考试：表示时间的介词

　　1、“在……时候”：at, on, in

　　⑴ at表示时间点，指“在……时刻”，“在……岁时”

　　He will come at 10:00 tomorrow. 他明天上午十点钟来。

　　At the end of the meeting, they sang the national anthem. 在会议结束时，他们唱了国歌。

　　⑵ on表示特定的某天或某个时间，指“在…..(星期几，某日，某日的早，午，晚，夜等)的时候”

　　I will attend the meeting on Monday. 我周一去开会。

　　His sister will come back from Canada on February 13th. 他姐姐2月13号从加拿大回来。

　　⑶

　　The construction of the building will be finished in 4 months.

　　这座桥的修建将在四个月内完工。

　　The event happened in the 20th century. 这件事发生在20世纪。

　　注意：通常我们表示在早中晚用：in the morning, in the afternoon, in the evening, at night。但如果表示早中晚等时间的词前后有表示时间的名词、表示特征的形容词或是定语从句修饰时，前面需用介词on。如：

　　We will hold a party on Christmas night. 我们会在圣诞节的晚上举行晚会。

　　练习：

　　1. The railway was opened to traffic ______ April 4, 1999.

　　2. Early ________ morning of May 1, we started off for the mountain village.

　　3. Miss Li will come back _______ five o’clock this afternoon.

　　4. He left ______ a cool morning in autumn.

　　5. I go on holiday ______ summer.

　　6. I started work ______ the end of August.

　　答案：1. on 2. on 3. at 4. on 5. in 6. at

　　2、by, to和until表示“到……时间”

　　⑴ by表示时间时意为“截止到(过去或将来)某一时刻为止，在此之前”。

　　By the end of last month she had studied here for three years.

　　到上月末，她在这里学习已满三年。

　　By the end of 2050 China will become an advanced country.

　　到2050年，中国将成为发达国家。

　　⑵ to常用于“from……to”中表示时间，也可用于计算时间。

　　They used to work from morning to night. 他们以前从早干到晚。

　　He will stay here to the end of the month. 他将在这里呆到月底。

　　⑶ until / till 意为“直到”，指执行的某件事一直延续到某一时刻未停止。

　　I waited for her until ten o’clock in the evening. 我等她一直到晚上十点。

　　Your passport will remain in operation until / till October. 你的护照在10月前有效。

　　练习：

　　1. It will be ready ______ (by, until) Thursday.

　　2. You will have to wait _______ (by, until) Thursday.

　　3. We ought to be there ________ (by, until) nine thirty.

　　4. ________ (by, until) the time you receive this letter I shall be back in Italy.

　　5. They worked ________ (by, until) ten and then went home.

　　6. It should have arrived ________ (by, until) now.

　　答案：1. by 2. until 3. by 4. by 5. until 6. by