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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。
13、leave+宾语+宾补
教材例句
句型解读
“leave+宾语+宾补”结构中leave 作为及物动词，可以表示“使保留，让…处于(某种状态、某地等)”。其后接形容词、分词、不定式、介词短语、名词或句子等补足语。
如：① I’m sorry I’ve left some questions unanswered.
② He left the windows open.
③ Don’t leave her to cook for 20 minutes.
14、部分否定
教材例句
All hope was lost.
句型解读
该句为部分否定。All, both, everyone, everybody, everything 以及every+名词都表示全部肯定；但当not 在它们之前或之后都表示部分否定。no one, none nobody, nothing, not…any, 以及 no+名词都表示全部否定。如：
① Both of them haven’t read this story.
并非他们二人都看过这个故事。
② All of the boys are clever, but none of them can work out this problem.
这些男孩都很聪明，但没有一个人能解出这道题。
③ All bamboo doesn’t grow tall.=Not all bamboo grows tall.
并非所有的竹子都长的高。
15、only 引导的倒装句
教材例句
We first broke the law in a way, which was peaceful; when this not allowed…only then did we decided to answer violence with violence.
句型解读
Only 位于句首，修饰副词、介词短语或状语从句时，句子采用部分倒装的语序；修饰状语从句时，只有主句采用部分倒装的语序。
如：① Only in this way can you come up with a solution to the problem.
只有这样，你才能想出解决这个问题的办法。
② Only after being asked three times did he come to the meeting.
叫了三次他才来参加会议。
③ Only when he is seriously ill does he ever stay in bed.
病的很重时，他才卧床休息。