2018中考英语：英语语法状语从句专项练习及答案

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　　1. 易混引导词while, when, as的区别：
        　　　　when可以和延续性动词连用，也可以和短暂性动词连用;而while和as只能和延续性动词连用。如：
        　　　　When he came in, his mother was cooking.
        　　　　When (While) we were at school, we went to the library every day.
        　　　　when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。
        　　　　While表示时间段,因此，while 从句的谓语动词要用延续性动词。如：
        　　　　Please don't talk so loud while others are working.
        　　　　As与when用法相似，但着重强调主句动作与从句动作同时发生，有"随着……"或"一边……一边……"之意。如：
        　　　　As you get older, you get more knowledge.随着年龄的增长，你获得的知识就越多。
        　　　　在将来时从句中，常用when，且从句须用一般时代替将来时。
        　　　　①You shall borrow the book when I have finished reading it.在我读完这本书后，你可以借阅。
        　　　　②When the manager comes here for a visit next week，Ill talk with him about this.下周，经理来这参观时，我会和他谈谈此事。
        　　　　when用于表示“一……就……”的句型中(指过去的事情)。
        　　　　sb.had hardly(=scarcely) done sth.when...=Hardly / Scarcely had sb.done sth.when...
        　　　　①I had hardly /scarcely closed my eyes when someone knocked at the door.=Hardly / Scarcely had I closed my eyes when someone knocked at the door.我刚一闭上眼，就有人在敲门了。
        　　　　②I had hardly /scarcely entered my room when the telephone rang.=Hardly /Scarcely had I entered my room when the telephone rang.我刚一走进房门，电话就响了
        　

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          　　　2.because,as,since 的区别：
        　　　　because用于表示直接原因,回答why提出的问题，语气最强;As用于说明原因, 着重点在主句，常译成"由于";since表示显然的或已知的理由或事实，常译成"既然"。如：
        　　　　Water is very important because we can't live without it.
        　　　　He didn't come yesterday as his mother was ill.
        　　　　I'll do it for you since you are busy.
        　　　　3.such…that, so…that, so that 引导结果状语从句的区别：
        　　　　such是形容词，修饰名词; so 是副词，修饰形容词或副词。其结构如下：
        　　　　1) such + a (n)+ 形容词+单数可数名词+that……
        　　　　2) such+形容词+复数可数名词+that ……
        　　　　3) such +形容词+不可数名词+that……。如：
        　　　　This was such a good film that I went to see it several times.
        　　　　It was such good books that they sell well.