英语句子语法Although species are indeed becoming extinct,only abou
英语句子语法 Although species are indeed becoming extinct,only about 0.7% of them are expected to disappear in the next 50years,not 25-50%,as has so often been predicted.请问as后面的是什么从句?主谓宾是什么?has是什么用法?
这个句子有两层从句. 首先它是一个although引导的让步状语从句(Although species are indeed becoming extinct). 主句是only about 0.7% of them are expected to disappear in the next 50years,not 25-50%,as has so often been predicted. 主句中又有一个从句,即as后面的非限制性定语从句. 在as引导的从句中,as作为主语,指代前面的25-50%;has是谓语,是have的三单形式.
as 引导的非限定性定语从句,as 关系代词在从句中作主语代替前面所讲的内容,谓语需用第三人称单数,谓语是has been predicte。 该从句用的被动语态,没有 宾语。如 My book was left at home. (我的书被落家了) My book 主语 was left 谓语,at home 地点状语。
as引导的是非限制性定语从句,修饰前边的only about 0.7% of them are expected to disappear in the next 50years,not 25-50%,as是关系代词,在从句里做主语,意思是“就像或正如”,谓语是has been predicted,宾语省略了,即by……,可以加在句尾。has这里是完成时态的标志,has been predicte...
尽管物种确实在消亡,但在未来五十年,只有大约百分之零点七而非百分之二十五到百分之五十的物种会消失,其百分之二十五到百分之五十的物种会消失的预测常常让人们信以为真。 语法分析: 1.only about 0.7% of them 是本句的主语,are expected 是本句的谓语,to disappear 是本句主语的补语。 2.as has so often been p...