如何使用時(shí)間狀語(yǔ)從句

　　時(shí)間狀語(yǔ)從句用表示時(shí)間的連詞連接一個(gè)句子作狀語(yǔ)，英語(yǔ)語(yǔ)法中該怎樣使用時(shí)間狀語(yǔ)從句呢?下面就讓學(xué)習(xí)啦小編來告訴你時(shí)間狀語(yǔ)從句的用法吧。

　　時(shí)間狀語(yǔ)從句的用法

　　由when，while引導(dǎo)的時(shí)間狀語(yǔ)從句。

　　例如：連詞細(xì)解

　　When you think you know nothing, then you begin to know something.當(dāng)你以為自己一無所知的時(shí)候，你就是在開始知道一些事物了。

　　When truth is buried under the ground ，it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.當(dāng)真理被埋在地下的時(shí)候，它在生長(zhǎng)，它感到壓抑，它蓄存著這么一種爆炸性力量，一旦冒出，它就會(huì)炸破一切!

　　Strike while the iron is hot. 趁熱打鐵。

　　You can feel the air moving as your hand pushes through it.當(dāng)你的手在空氣中揮動(dòng)的時(shí)候，你就能感覺到空氣在流動(dòng)。

　　Our headmaster laughed as she spoke.(我們的校長(zhǎng)邊談邊笑。)

　　主要時(shí)態(tài)：主現(xiàn)從不限;主過從四過;主將從現(xiàn)。

　　when, while和as的區(qū)別

　　when引導(dǎo)的從句的謂語(yǔ)動(dòng)詞可以是延續(xù)性的動(dòng)詞，可以是瞬時(shí)動(dòng)詞。并且when有時(shí)表示“就在那時(shí)”。例如：When she came in, I stopped eating.她進(jìn)來時(shí)，我停止吃飯。(瞬時(shí)動(dòng)詞)

　　When I lived in the countryside, I used to carry some water for him.當(dāng)我住在農(nóng)村時(shí)，我常常為他擔(dān)水。(延續(xù)性的動(dòng)詞)

　　We were about to leave when he came in.我們就要離開，就在那時(shí)他進(jìn)來了。

　　While引導(dǎo)的從句的謂語(yǔ)動(dòng)作必須是延續(xù)性的，并強(qiáng)調(diào)主句和從句的動(dòng)作同時(shí)發(fā)生(或者相對(duì)應(yīng))。并且while有時(shí)還可以表示對(duì)比。例如：

　　While my wife was reading the newspaper, I was watching TV. (was reading是延續(xù)性的動(dòng)詞，was reading和was watching同時(shí)發(fā)生) 。

　　I like playing football while you like playing basketball.我喜歡踢足球，而你喜歡打籃球。(對(duì)比)

　　As表示“一邊……一邊”，as引導(dǎo)的動(dòng)作是延續(xù)性的動(dòng)作，一般用于主句和從句動(dòng)作同時(shí)發(fā)生;as也可以強(qiáng)調(diào)“一先一后。例如：

　　We always sing as we walk.我們總是邊走邊唱。(as表示“一邊……一邊”)

　　As we were going out, it began to snow.當(dāng)我們出門時(shí)，開始下雪了。(as強(qiáng)調(diào)句中兩個(gè)動(dòng)作緊接著先后發(fā)生，而不強(qiáng)調(diào)開始下雪的特定時(shí)間)

　　由before和after引導(dǎo)的時(shí)間狀語(yǔ)從句

　　注意before引導(dǎo)的從句不再用否定式的謂語(yǔ)，并且當(dāng)before引導(dǎo)的從句位于主句之后，有時(shí)譯成“就，才”。還要注意主句和從句之間的時(shí)間關(guān)系。當(dāng)主句用將來時(shí)，從句總是用現(xiàn)在時(shí);如果before引導(dǎo)的主句謂語(yǔ)用的是過去完成時(shí)，則從句動(dòng)詞多用一般過去時(shí)，這樣以便體現(xiàn)動(dòng)作發(fā)生的先后。After表示主句動(dòng)作發(fā)生在從句動(dòng)作之后。主句和 從句的動(dòng)作的時(shí)間關(guān)系正好與before引導(dǎo)的從句相反。例如：

　　It will be four days before they come back. 他們要過四天才能回來。

　　Einstein almost knocked me down before he saw me.愛因斯坦幾乎把我撞倒才看到我。

　　My father had left for Canada just before the letter arrived.我父親恰好在信到之前去加拿大了。

　　They had not been married four months before they were divorced. 他們結(jié)婚還不到四個(gè)月就離婚了。

　　After you think it over, please let me know what you decide.你仔細(xì)考慮過以后，告訴我你是怎樣決定的。

　　After we had finished the work, we went home.完成工作之后，我們回家了。(從句用過去完成時(shí)，主句用一般過去時(shí))

　　由till或until引導(dǎo)的時(shí)間狀語(yǔ)從句。

　　till和until一般情況下兩者可以互換，但是在強(qiáng)調(diào)句型中多用until。并且要注意的是：如果主句中的謂語(yǔ)動(dòng)詞是瞬時(shí)動(dòng)詞時(shí)，必須用否定形式;如果主句中的謂語(yǔ)動(dòng)詞是延續(xù)性動(dòng)詞時(shí)，用肯定或否定形式都可以，但表達(dá)的意思不同。till不可以用在句首，而until可以放在句首。例如：

　　I didn't go to bed until(till) my father came back.直到我父親回來我才上床睡覺。

　　It was not until the meeting was over that he began to teach me English.直到散會(huì)之后他才開始教我英語(yǔ)。

　　I worked until he came back.我工作到他回來為止。

　　I didn't work until he came back.他回來我這才開始工作。

　　Please wait until I arrived.在我到達(dá)之前請(qǐng)等我。