虚拟语气的倒装以及错综虚拟语气
1. 注意四个情态动词的用法
（1）若表示在某一假设的条件下，必然而然就会发生某事，第一人称可用should或would, 而二、三人称只用would.
（2）若表示在某一假设条件下就能够干某事，各人称都用could.
（3）如果表示在某种假设条件下有可能会发生某事，各人称都用might.
2. 虚拟语气的倒装
当虚拟条件句中含有 were，had，should，could等动词时，可以将if省略，然后将 were，had，should，
could 等词移至句首。 
注意：以上移至句首的 had不一定是助动词，如果是实义动词也可倒装：
If he had money，he would buy a car. Had he money，he would buy a car.

3. 错综虚拟语气（主从句指的是不同的时间，根据上下文的意思采用不同的谓语动词形式）

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常见的两种错综虚拟语气：
（1）从句与过去事实相反相成，而主句与现在事实相反。例如：
   If you had not been strict with me when I was young, I could not be such a successful person now.（这种虚拟语气的特点是主句中常含有时间准状语now 或nowadays）
（2）Should anyone come and ask for me, tell them I will come back tomorrow.（主句为祈使句，条件句与将来事实相反，表示说话人认为某件事情发生的可能性很小。）

题1： Tom took the police to the spot ______ the accident happened．
A. which          B. that          C. where      D. when
题1： C 
详解：______ the accident happened是定语从句，其先行词是spot。从句缺少地点状语，所以选where。

题2： Our partnership with France Telecom is really a win-win situation ______ both sides benefit a great deal.
A. which          B. on which          C. why        D. where  
题2： D
详解：______ both sides benefit a great deal是定语从句，其先行词为situation。从句缺少地点状语，所以选where。这里where= in/under which。

题3： He wrote a lot of novels, none of ______ was translated into a foreign language. 
A. them    B. what        C. that    D. which
题3： D
详解：none of ______ was translated into a foreign language是非限制性定语从句，其现行词为novels。关系词作介词of的宾语，且介词前置，所以选which。

题4： After the adjustment of national holidays, many people put up Internet mails, 90 percent of ______voiced support.
A. which     B. whom     C. them     D. that 
题4： A
详解：90 percent of ______voiced support是定语从句，其先行词为Internet mails。关系词作介词of的宾语，且介词前置，所以选which。

题5： Behind the hill lies the school       I’ve studied for three years.
A. where B. when    C. there D. which
题5： A
详解：       I’ve studied for three years是定语从句，其先行词为school。从句中缺少地点状语，所以选where。

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