laterafteragobefore的用法

1、later、after、ago、before的用法：“一段時間+later/ago”分別表示“(多久)以后/以前”,主要用于過去時態(tài)?！癮fter/before+某個時刻”分別表示“在某時刻之后/之前”,此時兩個詞是介詞。ago與before：ago只能用于過去時,before用于完成時。如：He had an accident a week ago.(一周前出了一個事故).Some years later, the boy became a very famous singer.(數(shù)年后這個男孩成了著名的歌唱家).Have you been there before?(你從前到過那兒嗎？).

2、After a few years he gave up smoking.(過了幾年他戒了煙。) 加入收藏夾主題：單詞辨析 知識講解 before和ago after和later 有什么區(qū)別內(nèi)容：before和ago after和later 有什么區(qū)別 提交人：毛怡璇時間：7/31/2007 16:46:46主題：hi內(nèi)容：before和ago都能表示在一段時間以前，但是二者的內(nèi)涵和具體用法有明顯的區(qū)別： 1. before表示從過去或?qū)砟骋粫r間算起多少時間以前，由于與這一時間狀語連用的行為先發(fā)生在過去或?qū)砟骋粫r刻之前，因此往往出現(xiàn)在過去完成時態(tài)或?qū)硗瓿蓵r態(tài)中。例如： I called

3、him up last night， but his mother told me he had left for Wuhan two days before. She said that she had married him five years before.2.如果不具體表明多少時間以前，before意為從前；以前，表示從現(xiàn)在開始追溯到過去一段時間，或者主句的謂語動詞表示的是經(jīng)常、反復(fù)發(fā)生的行為，以副詞的形式置于句末，可以用在現(xiàn)在完成時態(tài)中。例如：I have never been to Beijing before.Have you ever seen a tiger before?

4、 I often go over the lessons that I have learned a few days before.注意： before前的時間狀語如果是特定的，含義不一樣。試比較：He said he had arrived here a day before. (一天前)He said he had arrived here the day before. (前一天)3. ago指的是從現(xiàn)在起到過去時間的某一點的一段時間。這個時間狀語常與一般過去時態(tài)或過去進(jìn)行時態(tài)連用。例如： I graduated from the college twenty years ago.I

5、was asked what I was doing a month ago.4. 表示在某一時間點或事件以前時，只能用before，不用ago。因為這種用法是將before當(dāng)作介詞或連詞使用。ago不具有這種功能。例如： He will come back before eleven oclock. Where did your brother study before he joined the army? It was hoped that this would be achieved before the year 2006.5.按語法規(guī)則，ago只能與一般過去時連用，但在since

6、three years ago這類短語中能與現(xiàn)在完成時態(tài)連用。因為three years ago構(gòu)成一個名詞短語，共同作since的賓格，意為自從三年前以來。例如： He has been here since three years ago. I have taught English in this school since twenty years ago.6. 含before的從句一般不用將來時態(tài)，如果采用will / would +V.時，一般被認(rèn)為是情態(tài)或虛擬語氣。例如：I would die before I would confess to it.7.如果before從句是一般

7、過去時態(tài)，所暗示的是過去發(fā)生的事，主句則宜用過去完成時，語義偏重于過去某階段的行為或狀況時，還可與一般過去時態(tài)連用。例如： I had never seen a Red Army man before I arrived in Xian. They asked me things that happened before the boy was born.8. 不少的語法書上說，before引導(dǎo)的從句習(xí)慣上不與否定的主句連用，要用until。實際上二者都可以，有時在意義上有些區(qū)別。試比較：He didnt arrive until I returned. 直到我回來時他才到達(dá)。He did n

8、ot arrive before I returned. 在我回來之前他尚未到達(dá)。I didnt manage to do it until you had explained how. 直到你解釋了如何干，我才設(shè)法完成了那項工作。I didnt manage to do it before you had explained how. 你解釋了如何干之后，我才設(shè)法完成了那件工作。9. before在句中的含義比較靈活，雖然before引導(dǎo)的也是一個時間狀語，但譯成漢語時卻不必死譯為在以前?？梢圆扇∠旅鎺追N譯法：(A)譯為才；(B)譯為就；(C)譯為尚未、還沒有、來不及、不要、別；(D)譯為在

9、的時候還沒有；(E)譯為如果、否則、免得；(F)譯為到、等到、沒等就；(G)譯為然后等。例如：A. It will be five years before we meet again. 要等五年我們才能再見面。We waited a long time before the train arrived. 我們等了很長時間火車才到達(dá)。B. I hadnt waited long before he came. 我沒等多久他就來了。He had not gone a mile before he felt tired. 還沒走一英里路，他就覺得累了。C. His father died befo

10、re he was born. 他尚未出世他父親就去世了。Catch him before he escapes. 抓住他，別讓他跑了。Take this computer before you change your mind. 買了這臺電腦，不要三心二意了。D. We arrived there before it began to rain. 我們到達(dá)那里的時候還沒下雨。E. Go before I call the police. 走吧，否則我叫警察了。I had better go now before it is too late. 我最好現(xiàn)在就走，免得太遲。Pigs will f

11、ly before hell be a scientist. 如果他當(dāng)科學(xué)家，豬都會飛了。F. The crops will die before the rain fall. 等到天下雨，莊稼早枯死了。Before I could sit down, he offered me a cup of tea. 沒等我坐下，他就給我端上一杯茶。G. I shaved before I went to the party. 我刮了臉，然后去參加宴會。初中英語易混詞辨析after，in，later after，in和later用來指時間時，都表示“在之后”，但它們的用法是有區(qū)別的。 當(dāng)表示以現(xiàn)在時間為

12、起點的“在之后”時，in后接時間段，after后接時間點。 He often comes back after ten oclock. 他經(jīng)常十點后回來。 Hell be here in a week. 他將在一周后到這里。 當(dāng)表示以過去某個時間為起點時，after之后可接時間點或時間段。而in只表示未來的事情，一般不用于過去某個時間。 After a few minutes she started to cry. 幾分鐘后，她開始哭了。 He said that he would come back in a year. 他說他一年后會回來。 after還可作連詞，引導(dǎo)時間狀語從句。 Aft

13、er he drank some water，he began to clean the table. 他喝了些水后，便開始擦桌子了。 Lets play baseball after school is over. 放學(xué)后我們玩棒球吧。 later多用作副詞，意為“稍后、之后”，通常用于時間段之后，此時應(yīng)與過去時連用。當(dāng)然，它也可單獨使用，表示以說話時為起點，不確定的時間以后，此時多與將來時連用。 At first she was asleep. Half an hour late/After half an hour she woke up. 開始她睡著了，半小時后醒來了。 The radio says that the sun will come out later. 收音機(jī)里說太陽稍后會出來。 自我測試 根據(jù)句意，用after，in或later填空。 1.Just seven the rain began to fall.