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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