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狀語從句是初中英語學習的重點，也是每年中考必考的內容之一。
中考主要考查引導狀語從句的連詞、從句時態等方面。重點考查時間狀語從句、條件狀語從句、結果狀語從句和比較狀語從句。
接下來我們就針對這四種從句的考查要點和連詞的使用進行系統總結。
狀語：狀語是句子的重要修飾成分。
狀語是謂語里的另一個附加成分,它附加在謂語中心語的前面,從情況,時間,處所,方式,條件,對象,肯定,否定,范圍和程度等方面對謂語中心進行修飾或限制。用來說明地點、時間、原因、目的、結果、條件、方向、程度、方式和伴隨狀況等。
狀語一般由副詞、介詞短語、分詞和分詞短語、不定式或相當于副詞的詞或短語來擔當。其位置一般放在句末，但也可放在句首或句中。
副詞是一種用來修飾動詞,形容詞,副詞或全句的詞,說明時間,地點,程度,方式等概念。
1.副詞一般在句子中做狀語.
He speaks English very well.
他英語說得非常好.(中的very是程度副詞，用來修飾well。very well是修飾speak的程度狀語)
He is playing under the tree.
他在樹下玩兒.(under the tree是地點狀語.)
2. 不定式在句子中可以作目的狀語。
I come specially to see you.
我專門來看你.
3.介詞短語
Ten years ago, She began to live in Dalian.
The boy was praised for his bravery.
4.從句作狀語
When she was 12 years old, she began to live in Dalian.
If I am not busy tomorrow, I will play football with you.
5.分詞作狀語
Having had a quarrel with his wife, he left home in a bad temper.
Inhibited in one direction, it now seems that the Mississippi is about to take another.
時間狀語從句
在復合句中，由時間連接詞引導的狀語從句叫做時間狀語從句。時間狀語從句通常由when, while, as，after,before,since,until等詞引導。
引導時間狀語從句的連詞很多，為更于理解，可分為以下三類：
1. 普通連詞如after, as, before, since, till, until, when, while等。I will tell you after they leave.他們走我再告訴你。He dropped the glass as he stood up.他站起來時，把杯子摔了。I’d better have a think before I decide.我最好還是先想想再作決定。We have known each other since we were children.我們從小就認識。He waited until she was about to leave.他等著一直到她準備離開。Shut the door after you when you go out.出去時請隨手關門。Stand still while I take your photograph.我給你拍照時站著不要動。
2. 表示“一……就”的連詞表示“一……就”的時間連詞除as soon as外，還有the moment, the minute, the second, the instant, immediately, directly, instantly, once, no sooner…than, hardly…when等。He started as soon as he received the news.他一接到消息就出發了。The moment I saw him I knew there was no hope.我一看到他就知道沒希望了。I want to see him the minute (that) he arrives.他一來到我就要見他。The instant he opened the door he saw the thief.他一開門就看見了這個賊。Immediately he came I told him the news.他一來我就把消息告訴了他。Once he arrives, we can start.他一來我們就可以開始。We had no sooner set out than it began to rain.我們剛出發就下雨了。She had hardly arrived when it began to snow.她剛到就下起雪來了。
3. 含有time的連詞這類連詞主要有every time(每次)，each time(每次)，(the) next time(下次)，any time(隨時)，(the) last time(上次)，the first time(第一次), by the time(當……的時候)。You can call me any time you want to.你隨時都可以給我打電話。Each time I went there, I saw him working.我每次去那兒都看見他在工作。Every time I see her I’ll think of it.每次我看到她，我就想起這事。Next time you come in, please close the door.下次你進來，請關門。He didn’t tell me the last time I saw him.我上次見到他時他沒告訴我。The first time I heard about the firm closing down was when George told me.我最初聽到公司倒閉的消息是喬治告訴我的。By the time he was taken to the hospital he was nearly dead.他被送到醫院時已經幾乎不行了。注意：every time, each time, any time前不用冠詞，(the) next time, (the) last time中的冠詞可以省略，而the first time中的冠詞通常不能省略。
when, while 和 as 引導時間狀語從句的用法
一、when 的用法
如果只從現象來看，when 從句用的最多的是一般過去時，而主句的時態沒有限制,根據具體情況而定。1. When he was a child he was always trying out new ideas.他小時候就常常試驗一些新的設想。2. When she came into my room, I was just reading a book.她走進我房間時，我正在看書。3. Were you writing when the teacher came in?老師進來的時候，你在寫信嗎?4. Sorry, I was out when you called me.對不起，你打電話來的時候我出去了。5. He was on the point of leaving when someone knocked at the door.他正要走，這時有人敲門。6. I thought of it just when you opened your mouth.就在你要說話的時候，我也想到了。根據以上的例句，我們可以總結出一點：when 從句的A事件，相當于另一個事件B發生的時間點。也就是說，when 從句的重點不在動作本身發生的狀態，而只是把它作為一個時間點，所以when 多數情況下用的是一般過去時，則不用正在進行時。因為如果用正在進行時，它表示的就是一段時間而不是一個時間點了。根據這一點，有的文章補充說：when 從句的動詞大多是瞬時動詞。這種說法也可以參照。實際上，when 從句也可以有其它的時態，但幾乎也不用進行時，因為它也只是作為一個時間參照點。：1. When I got to the airport, the guests had left.當我趕到飛機場時，客人們已經離開了。2. When he had finished his homework, he took a short rest.當他完成作業后，他休息了一會兒。3. Why do you want a new job when you have got such a good one already?你已經找到如此好的工作，為何還想再找新的?4. You shall borrow the book when I have finished reading it.在我讀完這本書后，你可以借閱。
