等于个圈圈
状语从句就是来修饰动词的那个句子，状语从句相当于一个副词，如：whenitrains,iusuallygotoschoolbybus.天下雨时，我通常坐公共汽车上学。（时间状语）ifhecomestomorrow,youwillseehim.如果他明天来，你就可以看见他。（if引导的条件状语从句，其结构为：if+状语从句，＋主句）。要注意在状语从句中有一个规则是“主将从现”，即主句是将来时，则从句要用一般现在时表示将来。
岚岛全屋定制
目的状语从句
从句部分是用以补充说明主句中谓语动词发生的目的的状语从句。表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导；目的状语从句的谓语常含有may, might, can, could, should, will, would等情态动词。
例句
引导目的状语从句的从属连词
主要的有 in order that, so that, in case, for fear等：
【注】so that 引导目的状语从句时有时可省略so而只用that，有时也可只用so：
目的状语从句与状语短语的转换
为了简洁起见，当目的状语从句的主语与主句的主语相同时，目的状语从句有时可用表目的的不定式短语替换：
有时还可与表示目的的介词短语替换：
一点注意
in case既可引导目的状语从句，也可引导条件状语从句，主要视句意而定：
【注】in case引导目的状语从句，从句有时可用“should+动词原形”这样的形式：
参考资料
英语语法网：
飘零雨迹
1．时间状语从句when ,while, as ,before, after, since, till/until, once, every/each time, whenever, [as soon as, the moment/the minute , hardly…when no sooner…than] 1)when , while , as 都可表当……时，但有区别。while 引起从句，表一段时间，而不是一点。有时还有对比的含义。While she was reading the newspaper, Grandma fell asleep.While I was reading , she was playing.When 可表从句动作先于或后于主句中的谓语动词而发生。When you have finished your report, you should type it out.另：when 可表“那时、突然”之意。 I was cooking in the kitchen, when I heard a terrible sound.as 强调动作的同时性，一边，一边As I was washing dishes, I sang songs.as 还可表“随着时间推移” You will get wiser as you grow wiser.2) as soon as, the moment/the minute , hardly…when no sooner…than 都可指“一……就” ，hardly…when 和no sooner…than 使用时通常用过去完成时，且常用倒装。He fell asleep the moment he went to bed.Hardly had he gone to bed when he fell asleep.注意： 在时间状语从句中，不能出现将来时的形式。2．原因状语从句as , since, because, now that 等引导。because 表直接的原因或理由，常译为因为。since 一般表对方已知的，无须加以说明的既成事实的理由，常译为“既然”。as 和because 语意相近，但语气较后者弱。另外还有一个起并列连词作用的for , 只能放于后半部，表示一种推理或解释，或用作附加说明。 The day must break , for the birds are singing.3．地点状语从句where, wherever ;注意不要和where所引起的定语从句弄混。We shall go where working conditions are difficult.（地点状语从句）We shall go to the place where working conditions are difficult.(定从，有先行词)4．条件状语从句if , unless, so(as ) long as, so far as , in case 注意从句中不能出现将来时的形式。5．让步状语从句although(though), even if (though), however, whatever注意：though (although)引起从句时，主句中不能出现but 。as 引起从句时，要采用倒装。Clever as he is, he doesn't study well.6．结果状语从句so, so (…)that , such…that 引导，放在主句之后。7．目的状语从句so that , in order that 引导，放于主句之后。注意：so (…)that 和 so that 的不同。 so that 引导目的状语从句时，从句中常会出现can , may, should 等情态动词，而so…that 则没有。 I'll show it to you again so that you can see it clearly.我再演示一次以便你能看清楚些。 He showed it me again so that I saw it clearly.他又演示一次，结果我看清了。8．方式状语从句as, as if , as though 等引导。as if 或as though 引导的从句，既可用陈述语气，也可用虚拟语气，表与主观上的不符。He looks as if he is ill. (说话方认为他有病。)He looks as if he were (was) ill.（说话方并不相信他有病）9．比较状语从句as…as, than , not so …as…注意：比较状语从句部分常用省略结构。 I know you better than he does.
