人教课标版必修高考英语I重点句型总复习(3)

　　9、although/though引导让步状语从句

　　教材例句

　　Although she didn’t know the best way of getting to places,…

　　句型解读

　　Although conj. “尽管，虽然”，引导让步状语从句。拓展：

　　① although 从句多在句首， though 从句可在主句前、中、后任何位置，而且though 可以作副词用于句末，作“但是，不过”讲，而although 无此用法。

　　② although 用来陈述事实而不用于假设，所以as though(仿佛，好像)，even though(即使，尽管)中不能用although。

　　③ though 引导的让步状语从句可以倒装(将表语、状语、情态动词后的动词原形前置到句首，此用法同as),而 although 不可以。

　　10、once 引导时间状语从句

　　教材例句

　　Once she has made up her mind, nothing can change it.

　　句型解读

　　Once 可作为从属连词，作“一(旦)……就……”解，连接一个表示时间的状语从句。从句中常用一般现在时，现在完成时表将来。

　　如：Once you have begin you must continue.

　　Once printed，the book will be very popular。

　　11.there be 句型

　　教材例句

　　Now, imagine there has been a big earthquake.

　　句型解读

　　“There +be +主语+其它成分”结构中there为引导词，本身无意义，谓语动词按照就近一致原则。其它相似句型还有：

　　There happen to be 碰巧有

　　There seems/appears to be 好像有

　　There is likely to be 可能有

　　There may/might be 也许有

　　There must be 一定有

　　There can’t be 不可能有

　　There is said/reported to be 据说/据报道有

　　There used to be 曾经有

　　There is sure/certain to be 一定有

　　12.It seems/seemed that…从句

　　教材例句

　　It seemed that the world was at an end。

　　句型解读

　　从句表示“(在某人)看来好像；似乎”

　　① It seems/looks/appears as if/though…看起来好像…

　　② Sb./Sth. looks as if/though…(不用seem/appear)

　　③ There seems/appears(to be)…(不用 look)

　　There appears to have been a mistake. =It appears that there has been a mistake.

　　④ It seems so. =So it seems.看来似乎是这样。

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