時(shí)間狀語(yǔ)從句是一種使用頻率極高的狀語(yǔ)從句，也往往是學(xué)習(xí)狀語(yǔ)從句的第一步。很多人看到各種變化的時(shí)態(tài)和豐富的連詞就開始覺得暈頭轉(zhuǎn)向了，但實(shí)際上時(shí)間狀語(yǔ)從句并不難學(xué)，它的各個(gè)連詞都是生活中常見的英語(yǔ)單詞，只要記住它們遵循的時(shí)態(tài)原則，就能慢慢掌握了。所以這次滬江小編就為大家整理了一些連詞的用法，希望能給大家?guī)韼椭?/p>

用表示時(shí)間的連詞連接一個(gè)句子作狀語(yǔ)，這樣的主從復(fù)合句就是時(shí)間狀語(yǔ)從句。

常用的連接詞有：when, while, as;before, after;as soon as, hardly...when..., no sooner...than...;till, until;since;by, by the time, by the end of。

一. when、while和as: “當(dāng)...時(shí)候”

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，也可以是瞬時(shí)動(dòng)詞，并且遵循主將從現(xiàn)原則：

eg. When she comes, I will tell her the bad news.

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)），也可以表達(dá)對(duì)比的意思。

eg. While my wife was reading the newspaper, I was watching TV. (同時(shí)發(fā)生)

???? I choose this one while you choose that one.（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。

eg. We always watch TV as we have dinner.（as表示“一邊……一邊”）

???? As we were going out, it began to snow.(我們下出門，再下的雪）

二. before,after: 表示時(shí)間先后，遵循主將從現(xiàn)原則, 在表達(dá)過去時(shí)，before所在的從句謂語(yǔ)動(dòng)詞要使用一般過去時(shí)，其主句謂語(yǔ)動(dòng)詞要采用過去完成時(shí)，而after所在的從句謂語(yǔ)動(dòng)詞要采用過去完成時(shí)，其主句謂語(yǔ)動(dòng)詞要采用一般過去時(shí)。

eg. It will be four days before they come back.

???? After she had arrived home, it began to rain.

???? Before it began to rain, she had already arrived school.

???? After she had arrived school, it began to rain.

三. till和until：“直到....”, 一般情況下兩者可以互換，till多用于肯定句，untill多用于否定，untill還可用于強(qiáng)調(diào)句。

eg. I didn't go to school until（till） my teacher called my parents.

???? It was not until he came to my home that I started go out my room.

四. since: "自從"，一般情況下，從句謂語(yǔ)動(dòng)詞用一般過去時(shí)，而主句的謂語(yǔ)動(dòng)詞用現(xiàn)在完成時(shí)。

eg. I have been in Beijing since 2012.

???? It is four years since I lived in Beijing.

好了，以上就是這次滬江小編為大家?guī)淼膬?nèi)容，大家都看明白了嗎？ 綜上所述我們可以看出，時(shí)間狀語(yǔ)從句里最重要的就是時(shí)態(tài)的使用，即使是意思相同的連詞，甚至是同一個(gè)連詞，因?yàn)闀r(shí)態(tài)的不同也會(huì)導(dǎo)致意思的不同，學(xué)習(xí)者們需要格外注意。