考点 29 原因状语从句高考频度:★★★★★原因状语从句是表达原因或理由的,引导此类从句的最常用的连词是 because, since, as , now that(既然)等,for 表达因果关系时(它引导的不是从句)为并列连词,语气不如 because 强
because 引导的原因状语从句 because 表达人们不懂得的直接的原因或理由,着重点在从句,其所引导的从句,为全句句意的中心所在
一般用于回答 why 引出的疑问句,语气最强,除尤其强调外,该从句一般位于主句背面
I didn’t go abroad with her because I couldn’t afford it
我没有和她一起出国是由于费用太高
Don’t scamp your work because you are pressed for time
不要由于时间仓促而马马虎虎
I wonder whether his hearing is okay _______________ he has turned the television up very loud
unlessB
althoughC
untilD
because【答案】 D2
as 引导的原因状语从句 as 引导的原因状语从句所引出的理由在说话人开来已经很明显,或已为听话人所熟悉而不需要强调,从句多位于主句之前,一般可以和 since 换用,as 语气稍弱
As I didn’t know the way,I asked a policeman
我不认识路,因而问警察
As it is snowing, we shall not climb the mountain
由于在下雪,我们不去爬山了
___________ you weren’t there, I left a message