We waited until he came.
2．用于否定句时，主句谓语动词是非延续性动 词，从句为肯定，意为“某动作直到某时间才开 始”。如He won’t go to bed till/until she returns.
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3．till不可以置于句首，而until可以。如： Until you told me I had no idea of it.
❖ If she asks me, I’ll tell her. 她如果问我，我就告诉她。（if是从属连词）
❖ You look as if you need a rest. ❖ 你像是需要休息似的。（as if是从属连词）.
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状语从句的种类
1、时间状语从句 when, while, as
soon as, since, until, before, after
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※ as : 当…时；一边…一边；随着……
＊某事一发生，另一事立即发生
As the captain passed me, I asked him whether there was any hope of saving the ship. ＊两个动作同时发生
As the day went on, the weather got worse.
状语从句 讲练
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状语从句
用作状语的从句叫做状语从句。引导状语从句的关联词是 一些从属连词。
❖ 例：
❖ When you cross the road, you must be careful. 当你过马路时要小心。（when是从属连词）
❖ I was late because I missed the bus. 我迟到了，因为我误了公共汽车。 （ because是从属连词）.
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while /when辨析
❖ when/while+doing ❖ When/while reading,he fell asleep. ❖ when+终止性、延续性动词 ❖ while+延续性动词 ❖ When the teacher came in,I was sleeping. ❖ =While /When I was sleeping, the teacher came in. ❖ when (就在这时) ❖ I was sleeping, when someone knocked at the door.
2、条件状语从句 if
3、结果状语从句 so…that
4、比较状语从句 than
5、原因状语从句 because
6、让步状语从句 although, though
7、地点状语从句 精选 where
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1. 时间状语从句
❖引导时间状语从句的关联词常有：after, before, when, while, whenever, as soon as, as, since, until 等。
We sailed four days and nights before we saw the land.
We hadn’t run a mile before he felt tired.
④肯定句 “ 才” 否定句
“就”
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※till, until和not…until：
1.until/till引导时间状语从句用于肯定句时，主句 的动词是延续性动词，表示动作或状态一直持续 到until/till所表示的时间，意为“某动作一直延续 到某时间点才停止”。如：
It will be half a year before I come back.
②it will be +一段时间 before......多久之后才.
It won’t be half a year before we meet again.
③it won’t be +一段时间 before......不久就....
Before they came back, we had finished the work.
他们回来前，我们已经完成工作了。
We haven’t seen each other since he left.
从他离开后我们没见过面。
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※ when: 持续性／非持续性动词都可以 当…时
Are you going to be a sailor when you leave school?
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1. _W__h_e_n_ he comes here tomorrow, I will call you.
❖例：
❖ The ball goes up very high after it hits the ground. 这球着地后蹦得很高。
❖ Wait until you’re called. 你等着叫你吧！
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When he came, I was cooking. 他来时，我在做饭。
I’ll call you as soon as I come back. 我一回来就给你打电话。
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※while 的其他含义：
While I was walking down the street, I came across an old friend. ( while =__w_h_e_n__)
He likes pop music, while I am fond of folk
music. ( while =_b_u__t ___)
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★ as的常见用法： 1.She sang as she worked.
一边……一边…… 2. You must try to do as I did.
像…..一样 3. As she was late for class, she had to
say sorry. 由于
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※ before ① 在……前
While I really don’t like art, I find his work impressive. (while=__a_lt_h_o_u_g_h___)
While there is life there is hope. (while=___a_s_l_o_n_g_a_s_____)