原因狀語(yǔ)從句課件-高考英語(yǔ)復(fù)習(xí)

1、原因狀語(yǔ)從句1.定義：在句子中用來(lái)說(shuō)明主句的句子叫原因狀語(yǔ)從句。2.常用引導(dǎo)詞：because, as, since, now .3.時(shí)態(tài)：從句一般根據(jù)實(shí)際情況選用適當(dāng)?shù)臅r(shí)態(tài)。通常是主現(xiàn)從現(xiàn)，主過(guò)從過(guò)Because用來(lái)回答why的問題，語(yǔ)氣最強(qiáng)一般放在主句之后不能與so同時(shí)出現(xiàn)可用only，just，perhaps等強(qiáng)調(diào)詞修飾-Why did you come back late yesterday?-Because I was on duty.I came back late yesterday because I was on duty.Becauseso(對(duì)它說(shuō)：漏！)Only beca

2、use，Just because,Perhaps becauseBecause的否定轉(zhuǎn)移主句是否定的情況下，because引導(dǎo)的原因狀語(yǔ)從句，可按正常翻譯，也可按否定轉(zhuǎn)移理解I did not marry her because I loved her.因?yàn)槲覑鬯?，所以我決定不跟她結(jié)婚。我并不是因?yàn)閻鬯藕退Y(jié)婚。（？）Since（既然）一般放在句首更強(qiáng)調(diào)主句內(nèi)容Since everyone is here, lets begin our meeting.As(由于)一般解釋雙方都知道的事情從句說(shuō)明原因，主句說(shuō)明結(jié)果As he didnt know much English, he looke

3、d up the word in the dictionary.because, since, as的區(qū)別Because引導(dǎo)的從句一般放在主句的后面，且because位于句首時(shí)要用逗號(hào)隔開。Because表示直接原因，語(yǔ)氣最強(qiáng)，最適合回答why引導(dǎo)的疑問句。Because of也表示原因，但后面不接從句，只能接名詞、代詞、動(dòng)名詞。Because和so不能同時(shí)出現(xiàn)在一個(gè)句子中。because, since, as的區(qū)別Since引導(dǎo)從句一般放于主句之前表示已知的、顯然的理由，語(yǔ)氣比because弱。As引導(dǎo)從句時(shí)表示附帶說(shuō)明的雙方已知的原因，含有對(duì)比說(shuō)明的意味，語(yǔ)氣比since弱，位置較為靈活。

4、語(yǔ)氣強(qiáng)弱：becausesinceasfor只能用句尾，且要使用逗號(hào)與主句隔開For引導(dǎo)的從句只提供輔助說(shuō)明It rained last night, for the ground is wet.For引導(dǎo)的是并列句表示原因但不說(shuō)明主句行為發(fā)生的直接原因，只提供一些輔助性的補(bǔ)充說(shuō)明。For引導(dǎo)的并列句只能放于主句之后且必須用逗號(hào)將其于主句隔開。復(fù)合連詞引導(dǎo)In that：原因就在于、因?yàn)?，引?dǎo)的從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)，與since相似，鑒于、考慮到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?yàn)槎且驗(yàn)镮 do nothing, not because Im lazy, but because Im scared.我什么也沒做，不是因?yàn)槲覒校且驗(yàn)槲遗?。介詞短語(yǔ)Because ofdue toowing to(放句首)不接從句，接名詞短語(yǔ)Owing to his careles