状语从句相关知识点（三）

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状语从句的用种类：

1、时间状语从句：
        表示时间的状语从句可由when, as, while, whenever, after, before, till(until), since, once, as soon as(或the moment), by the time, no sooner…than, hardly(scarcely)… when, everytime等引导。 　　
       e.g. When I came into the office, the teachers were having a meeting. 　　
       He started as soon as he received the news. 　　
       Once you see him, you will never forget him. 　　
       No sooner had I gone to bed than I went to sleep. 　　
        2、原因状语从句：
       原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是because, since, as, nowthat（既然）等，for表示因果关系时（它引导的不是从句）为并列连词，语气不如because强。 　　

e.g. He is disappointed because he didn't get the position. 　　
        As it is raining, I will not go out. 　　
        Now that you mention it, I do remember. 　　
         3、地点状语从句： 　　
         引导地点状语从句的连词是where和wherever等。 　　
         e.g. Sit wherever you like. 　　
         Make a mark where you have a question. 　　
          4、目的状语从句： 　　
          引导目的状语从句最常用的词（组）是so, so that（从句谓语常有情态动词）, in order that, in case（以防，以免）等。 　　
          e.g. Speak clearly, so that they may understand you. 　　
          She has bought the book in order that she could follow the TV lessons. 　　
          He left early in case he should miss the train.