原因状语从句课件-高考英语复习

1、原因状语从句1.定义：在句子中用来说明主句的句子叫原因状语从句。2.常用引导词：because, as, since, now .3.时态：从句一般根据实际情况选用适当的时态。通常是主现从现，主过从过Because用来回答why的问题，语气最强一般放在主句之后不能与so同时出现可用only，just，perhaps等强调词修饰-Why did you come back late yesterday?-Because I was on duty.I came back late yesterday because I was on duty.Becauseso(对它说：漏！)Only beca

2、use，Just because,Perhaps becauseBecause的否定转移主句是否定的情况下，because引导的原因状语从句，可按正常翻译，也可按否定转移理解I did not marry her because I loved her.因为我爱她，所以我决定不跟她结婚。我并不是因为爱她才和她结婚。（？）Since（既然）一般放在句首更强调主句内容Since everyone is here, lets begin our meeting.As(由于)一般解释双方都知道的事情从句说明原因，主句说明结果As he didnt know much English, he looke

3、d up the word in the dictionary.because, since, as的区别Because引导的从句一般放在主句的后面，且because位于句首时要用逗号隔开。Because表示直接原因，语气最强，最适合回答why引导的疑问句。Because of也表示原因，但后面不接从句，只能接名词、代词、动名词。Because和so不能同时出现在一个句子中。because, since, as的区别Since引导从句一般放于主句之前表示已知的、显然的理由，语气比because弱。As引导从句时表示附带说明的双方已知的原因，含有对比说明的意味，语气比since弱，位置较为灵活。

4、语气强弱：becausesinceasfor只能用句尾，且要使用逗号与主句隔开For引导的从句只提供辅助说明It rained last night, for the ground is wet.For引导的是并列句表示原因但不说明主句行为发生的直接原因，只提供一些辅助性的补充说明。For引导的并列句只能放于主句之后且必须用逗号将其于主句隔开。复合连词引导In that：原因就在于、因为，引导的从句一般放在主句之后Ive been lucky in that I have never had to worry about money. Seeing (that)、Now (that)、Cons

5、idering (that)，与since相似，鉴于、考虑到Seeing that it is raining hard, we will have to stay here for the night.Now that you are here, youd better stay for dinner.Considering that the villagers look very kind, your response is a little extreme.I wont stay long, seeing that youre busy.Not becausebut because做某事，不是因为而是因为I do nothing, not because Im lazy, but because Im scared.我什么也没做，不是因为我懒，而是因为我怕。介词短语Because ofdue toowing to(放句首)不接从句，接名词短语Owing to his careles