表时间的介词 知识点
表示时间的介词，在英语介词中占着相当重要的位置，其中有：at， on ，in ，during， for， to， till， until， after，by， before等。
1. at ，on， in
a）at用来表示时间时，通常指时间的某一点。例如：at five o'clock， at noon ，at midnight.
b）on用来表示某一段时间，特指某天或某天的上午、下午或晚上。例如：on Sunday,on Saturday morning.
c）in也可用来表示一段时间，但多指长于一天或不到一天的时间段。例如：in January, in summer, in 1988, in the morning , in the evening.
2. in与during
a）during用来表示一段时间，其意义大致相当于in的用法。一般来说，凡是能用in的地方，也可以用during。
例如：1. He came to see me during my absence.我不在时他来看过我。
2.Don't go to see his wife in his absence.当他不在的时候不要去见他妻子。
b）during与in的区别在于during强调时间的延续性，而in则只是一般指某一时间。试比较：They visited many cities during their stay in China.呆在中国期间他们走访了很多城市。Her grandpa was killed in the war.她的祖父死于战争中。
3. in, for ,during
a）“in＋时间”与“for＋时间”都可表示一段时间，但“for＋时间”表示“有多久”，而“in＋时间”则表示“在何时”。例如：We worked there for the winter.整个冬天我们都工作在那里。They worked there in winter.冬天我们在那工作。以上两例中，in winter强调“在冬季”，不一定包括整个冬季时间，而for the winter则强调“整个冬天”。
b）for用来表示一般时间，常跟具体的时间段。例如 for a few days，for 3 weeks，for five months等
4. since与after 都可以用来引导表示从过去某一点开始的时间段词组。它们的不同之处在于：
a）since引导的词组所表示的时间一直延续到说话时为止，因而要与现在完成时连用。例如：He has been there twice since 1982.自从1982年，他去过那里两次。
b）after引导的词组所表示的时间是纯系过去，并不延续到说话时，因此要和一般过去时连用。例如：He went home after school.放学后他回家了。
5. till, until与to
a）介词till／until常用于“from.……till／until”结构中，表示“一个动作的终结”。介词to 常用在“from.……to”的结构中，用来表示“一个阶段的终结”。两者在这种结构中意义十分接近。例如：The Americans stayed here from June to September. The Americans stayed here from June to September. He studies from morning till／until night every day.每天从早到晚他在学习。
b）to可用在表示钟点的词前。我们说It's six to five. 但不能说It's six till／until five.反之在某些能用till／until的场合，却不能用to.例如：在“not.……until”结构中，我们说 I didn't go to bed till／until ten o'clock.却不能说I didn't go to bed to ten o’clock.
c）till与until也有细微区别。till常用在非正式文体或口语中，而until则常用于正式文体及比较正式的场合。另外，在句首多用until.
6. by 与before
a）by表示时间时，意思是“到……以前”、“不迟于”、“到……时（为止）”。例如：by supper time， by the end of last term
b）before表示时间，意为“在……以前”。例如：before liberation， the day before yesterday
c）by与before的区别在于，by短语表示时间，强调“终止点”，而before短语表示时间，强调“起始点”。例如：Your son will be all right by supper time.你儿子晚饭前就会好的。
句中的by supper time表示从说话时到晚饭前这段时间。而before构成短语则表示从某一时间或事件之前，例如：The poor children couldn't go to school before liberation.这些可怜的孩子在解放前不能上学。
表时间的介词 知识点题库
To be an excellent runner, you must be prepared to go through much hard work
.
A . for a start
B . at the first
C . with a start
D . at last
The conference will begin in an hour; ________, let's have a rest.
A . on the meantime
B . in the meantimes
C . in the meantime
D . in meanwhile
________， the headmaster rose to indicate that the conversation was ________.
A . At an end; in an end
B . In the end; at an end
C . In an end; at the end
D . At the end; in the end
When the meeting was ________, they all ________ to their feet and left.
A . at the end; raised
B . at an end; rose
C . in the end; raised
D . by the end; rose
BRICS(金砖国家) Leaders Meeting was held in Sanya, April 14, 2011.
A . to
B . in
C . at
D . on
Not only______an explorer but also he was a great thinker______this thirties.
A . he was...in
B . was he...at
C . was he...in
D . he was...at
Hearing the war was , the crowd all burst into .
A . at the end, tears
B . at an end, crying
C . at an end, tears
D . in the end, citing
—Hello! Is Mr. John in the office?
—Yes. But I'm sorry. He is busy ________ and can't speak to you.
A . at once
B . at present
C . at the end
D . at first
You should receive a reply (在……之内) seven days.
Everyone will be given a telephone number birth that will never change no matter where they live.
Please keep an eye on my belongings, including the book on AI. I will be back .
A . at no time
B . in no time
C . in a time
D . at one time
When the meeting was , they all to their feet and left.
A . at the end; raised
B . at an end; rose
C . in the end; raised
D . by the end; rose
The shop closes ______9:30 ________the evening.
A . in; in
B . at; in
C . at; at
D . at; on
These are what scientists call S waves, S standing “second”.
