65 表示時間、日期的介詞 Track57
65 表示時間、日期的介詞 Track57
（1）at，in，on
1）at（主要表示時間點(diǎn)）
①用來表示在特定的某一時刻。例如：
at nine a.m. 在上午九點(diǎn)鐘 at nine after ten在十點(diǎn)零九分
②用來表示不確定的某一時刻。例如：
at night at dawn at midnight at that time at the moment
at the beginning/end of at Christmas在圣誕節(jié)期間
at Easter在復(fù)活節(jié)期間
注意：on Christmas Day 在圣誕節(jié)當(dāng)天
③用來表示年齡段。例如：
at the age of eight/at eight
He got married at twenty. 他二十歲結(jié)婚。
2）in（主要表示時間段）
①一般指在相對較長的一段時間內(nèi)。例如：
in the morning/afternoon/evening
in spring/summer/autumn/winter
in the past/in the past ten years 在過去/在過去十年中
in the twenty-first century 在二十一世紀(jì)
a man in his thirties 一個三十幾歲的男子
②in還可表示“在……時間之內(nèi)/之后”，通常用于將來時態(tài)中。例如：
a. He said he would come back in a month.
b. The train is leaving in a minute.
③in+動名詞：in doing sth.
這一用法的意思相當(dāng)于：during the course of doing sth.，即“在做……的過程當(dāng)中”，例如：
a. In crossing the river, we caught some fish.
b. In working, we can learn a lot.
3）on（主要表示具體的某一天）
①表示具體的日期和星期。例如：
on Monday (Tuesday/Wednesday/Thursday/Friday/Saturday/Sunday)
on my birthday
on their wedding anniversary
The People's Republic of China was founded on October 1st, 1949.
注意：如果不是具體的幾月幾日，而只是說幾月，我們要用介詞in, 如：in October。
②表示特定某一天的上午、下午、凌晨或半夜等。例如：
on the night/morning/afternoon of December 31, 1999
on the eve of Christmas/New Year
on a hot midnight in July
on the afternoon of April 1, 1990
on a cold afternoon in January
a. I like going out for a walk on a fine day. 我喜歡在好天氣出去散步。
b. On that particular evening, there was a strange excitement in the air.
注意：如上所述，如不是特定的某一天的某一時刻，則用at。
③表示“在第幾天”。例如：
on his first day to school
On the tenth day I was in Beijing.
④ on+動名詞或名詞：on doing sth.
這一用法的意思相當(dāng)于when somebody does sth.或as soon as somebody does sth.，即“在做……的時候”或“一……就……”，例如：
a. On hearing the bad news, she burst into tears.
一聽說這個壞消息，她禁不住哭了起來。
b. On arriving, I came directly to visit you.
我一到達(dá)，就直接來看你了。
4）in the beginning/end與at the beginning/end
at the beginning表示“在……的開頭”，例如：
At the beginning of a book there is often a table of contents.
一本書的開頭，通常有個目錄。
at the beginning of the concert
at the beginning of January
in the beginning意思相當(dāng)于at first或in the early stages，“在最初，起初”，暗含著以后會有所變化。例如：
In the beginning, I wrote to my family regularly; later I just gave up. 一開始，我定期給家里寫信，后來就不寫了。
同樣，at the end表示“在……末尾，在……最后”，例如：
a. But at the end of this process, unfortunately, the students are none the wiser.
遺憾的是，經(jīng)過這段時間的培訓(xùn)，這些學(xué)生并沒有聰明多少。
b. At the end of a book there may be an index.
書的結(jié)尾可能會有個索引。
at the end of the concert 演奏會的尾聲
at the end of January 一月底
in the end則與in the beginning相對應(yīng)，表示“最終……”，相當(dāng)于eventually或at last。例如：
a. At first his mother opposed the marriage, but in the end she gave her consent. 一開始他母親反對這樁婚事，但最后還是同意了。
b. Jim couldn't decide where to go for his holidays. He didn't go anywhere in the end. 吉姆不知道去哪里度假，最后他哪里都沒去。
c. He got more and more angry. In the end he just walked out of the room. 他越來越生氣，最后徑直走出房間。
at the beginning/end通常與of連用。而in the beginning/end一般不能接of短語，我們不能說：in the beginning/end of something*。
5）last/next/this/every前不用at/on/in：
a. I'll see you next Friday.?。ú徽f：on next Friday*）
b. Do you work every Sunday? （不說：on every Sunday*）
（2）during，for
上面三個表示時間的介詞，主要是表示某一時刻（in可表示一段時間）。而during和for則表示一段時間。他們后面接表示“時間段”的名詞。
1）during表示“在……期間內(nèi)”，強(qiáng)調(diào)在某一期間發(fā)生了什么事。表示事件發(fā)生的過程，不表示在此過程中事件發(fā)生的起止時間。for則表示這件事延續(xù)時間的長短，指出了事件發(fā)生的開始時間。
a. I had lived in the countryside for 8 years before I moved to Beijing. 在搬到北京之前，我在鄉(xiāng)下住了八年。
b. I studied in this university for 4 years. During that time most of my time was spent in learning English.
我在大學(xué)學(xué)習(xí)了四年，在這期間，大多數(shù)時間我都花在學(xué)英語上了。
c. My father was in hospital for six weeks during the summer.
夏天，我父親在醫(yī)院住院六個星期。
2）during可接表示事件延續(xù)一段時間的名詞，如stay，visit，travel等；for一般不能這樣用。如：
during my visit to China 在我訪問中國期間
during the travel to the south 在去南方途中
during the Middle Ages 在中世紀(jì)
during his childhood 在他童年時期
during my holidays 在我的假期
而for一般只接具體的時間量。如：
for six years
for two months
for ever
for two hours
（3）from, since, for
1）from
from通常要和介詞to或till/until連用。如：
Most people work from nine to five. 多數(shù)人過著朝九晚五的生活。
2）since
since+時間點(diǎn)，表示“從那一時刻起”，事件開始發(fā)生，它通常要與現(xiàn)在完成時或過去完成時連用。
a. He has been here since last Sunday.
自從上星期日起，他就一直在這兒。
b. I haven't seen him since two years ago. 我兩年沒見他了。
c. I haven't seen him for two years.
d. It's two years since I last saw him.
3）for
for+時間段，表示動作延續(xù)到說話的那一時刻。通常也要與現(xiàn)在完成時或過去完成時連用。如上面例句所示，“for+一段時間”可與“since+動作開始的時刻”替換。
a. I have lived here for a year.
b. I have lived here since this time last year.
（4）before, after, till/until
這幾個詞即可作介詞接短語，又可用作連詞接從句。它們后面所接的時間一般是“時間點(diǎn)”，以表示“在某一時刻之前（before）”、“在某一時刻之后（after）”、“一直到某一時刻為止（till/until）”。例如：
a. We finished the work before 10 o'clock.
b. I'll wait for you till 10 o'clock.
需要注意的是till/until的如下用法特點(diǎn)：
1）延續(xù)性句子謂語（用肯定）+till/until+時間點(diǎn)（若是從句，則從句中的謂語動詞是短暫性動詞）
2）短暫性句子謂語（用否定）+till/until+時間點(diǎn)（若是從句，則從句中的謂語動詞是短暫性動詞）
c. He didn't finish the work until 10 o'clock. （finish短暫性動詞，用否定）
d. He didn't leave the office till 12 o'clock.
e. He will stay here until next Sunday. （stay延續(xù)性動詞，用肯定）
（5）by
1）by的意思是no later than，表示“不遲于某個時間”、“到了某個時間”。例如：
by the end of next year 到明年年底為止
2）by引導(dǎo)的時間狀語常與將來完成時態(tài)或過去完成時態(tài)連用。例如：
a. By the end of next year I'll have learned 2,000 words. （將來完成時）
b. By the end of last year I had learned 2,000 words. （過去完成時）
