引导状语从句的从属连词都有哪些？？？

引导状语从句的从属连词都有哪些？？？

引导状语从句的引导词语有时间状语从句：when，while，as，before，after，till（或untill），since地点状语从句：where原因状语从句：because，since，as，for目的状语从句：so that，in order that，least，in case方式状语从句：as，as（if）though结果状语从句：so（such）...that...,so that条件状语从句：if，unless，in case，as long as让步状语从句：although，though，，as

1）引导原因状语从句的连词主要有because, as, since:

　　because:

　　because it was wet he took a taxi. 由于下雨他叫了一辆出租车。

　　he was worried because he hadn’t had any letter from her.

　　他很担忧因为他没收到过她一封信。

　　as:

　　as david had a passion for walking, we started off on foot.

　　由于大卫喜欢走路，我们就步行出发了。

　　as you’re sorry, i’ll forgive you. 既然你悔悟了，我就原谅你。

2）还有一些表示原因的状语从句由seeing（that）,considering(that)或now that等引导：

　　please don’t try to back out now that everything has been arranged.

　　现在一切都安排好了，请不要打退堂鼓。

　　now you’re here, you may make yourself useful. 你已经来了，不妨帮帮忙。

　　3）许多用在形容词后的that从句也起原因状语的作用（that 有时可省略）：

　　she was glad that she had controlled herself. 她很高兴控制住了自己。

　　i’m disappointed that they cannot come. 他们不能来我很失望。

■when 的用法。表示“当……时候”。如：　　The house shook when the trains went by. 火车经过时房子会震动。　　When she saw this，she turned red. 她看到这时脸红了。　　I played football every day when I was a boy. 我小时候天天踢足球。　　■while 的用法。表示“当……时候”。如：　　I’ll take care of him while you are away. 你不在时我照顾他。　　I met Diana while I Was shopping this morning. 我今早买东西时碰到了戴安娜。　　While I was waiting for the bus I dropped my purse. 我等公共汽车时把钱包丢了。　　注意：while 所引导的时间状语从句中谓语动词必须是持续性的，不能是短暂性的。　　■as 的用法。表示“当……时候”。如：　　He dropped the glass as he stood up. 他站起来时，把杯子摔了。　　The phone rang just as I was leaving. 我正要离开，电话铃就响了起来。　　■before 的用法。表示“在……之前”。如：　　I hadn’t waited long before she came. 我没等多久她就来了。　　It was a long time before I got to sleep again. 好久我才又睡着。　　I must finish this letter before I go home. 我必须在回家以前写完这封信。　　■after 的用法。表示“在之后”：　　She left after they arrived. 她在他们到达后走了。　　I told them after you (had) left. 你走后我把这事告诉了他们。　　■until / till 的用法。表示“直到…”：　　He waited till [until] I returned. 他一直等到我回来。　　Walk till [until] you come to a white house. 走下去，一直走到一座白房子为止。　　这类句型的主句动词通常只能是延续性动词，不能是终止性动词。但在否定句中，则主句动词可以是终止性动词，此时构成not…until [till]…句式，意为“直到……才”。如：　　He didn’t leave until [till] I came. 直到我来他才走(来自 www.zkenglish.com)。　　You cannot leave until your work is finished. 在你的工作没完成以前你不能离开。　　在否定句中，主句谓语为延续性动词和终止性动词均可，注意含义不同：　　He didn’t leave until I came. 直到我来他才走。　　He didn’t wait until I came. 他没有等到我来(即在我来之前就走了)。　　■since 的用法。表示“自从…”：　　We have known each other since we were children. 我们从小就(相互)认识。　　I haven’t heard from him since he left. 他走之后我还没接到过他的信。　　这类句子的主句通常用现在完成时。　　■as soon as 的用法。表示“一…就…”：　　Tell him as soon as he arrives. 他一到就告诉他。　　I shall ring you up as soon as I arrive. 我一到就给你打电话。　　I抣l let you know as soon as I hear from her. 我一接到她的信就通知你。　　表示“一…就…”这一意思，除用as soon as外，还可用the moment, the minute等：　　I want to see him the minute [=as soon as] he arrives. 他一到达我就要见他。

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