英语四级语法的考查重点（二）

   ② 虚拟条件句有单一条件句，也有混合虚拟条件句，所以不能只根据从句与某一事实相反来判断主句就与该事实相反，同样，也不能想当然地认为主句与某一事实相反，从句也就与该事实相反。
       
        如1）从句与过去事实相反，而主句与现在事实相反。再如：
        If he weren't such a kind man, he wouldn't lent a hand to such people as you the other day. (从句与现在事实相反，主句与过去事实相反。)
        Were my friends not to come tomorrow, I wouldn't have bought so many foods. (从句与将来事实相反，主句与过去事实相反。)
       
        ③ 熟记主从句动词与不同事实相反时的时态运用规则。解题时根据句子所表达的时间概念确定与什么事实相反，然后采用相应的时态。
        如果与过去事实相反，从句中用过去完成时，主句中用would/should/could/might + have done的形式，如2）6）和7）。
        如果与现在事实相反，从句中用一般过去时，主句中用would/could/might/should + 原形动词，表示与正在进行的事实相反用would/might/could/should + be doing的结构，如1）。
        如果表示将来不可能实现的事情，从句中用过去时，或were to / should + 原形动词，以上3） 4） 5）表示的都属于这种情况。
       
        ④ if引导条件状语从句时，可以将were/had/should提至句首，省略if。考试时经常是将省略if的与含有if的选项并列，在这种情况下，应注意分清从句的时态，尽管多数情况下都是倒装的结构为正确选项。如2）3）5）。
       
        ⑤ If it weren't/hadn't been for …以及其倒装结构were it not for/had it not been for表示"如果不是……的话"
       
        ⑥ 正如真实条件从句中不用will一样，虚拟条件从句中也不可使用would，应特别注意。
       
        Self-practice
        上面我们一起分析了虚拟条件句中虚拟语气的考查特点和解题规律，下面请自己做以下《语法分词》第十一章第一节的有关题目，进行自测。
       
        2．含蓄条件句中的虚拟语气
        Test Yourself
        首先还是请同学们先做一下下面两题。
        1) Some women ____a good salary in a job instead of staying home, but they decided not to work for the sake of the family.
        A. must make B. should have made
        C. would make D. could have made (2000.1)
        2) We didn't know his telephone number, otherwise we ___ him.
        A. would have telephoned B. must have telephoned
        C. would telephone D. had telephoned (1995.6)
       
        Explanation and Expansion
        A．参考答案 1）D 2）A
        B．评析
        含蓄虚拟条件句指没有明确的条件从句的虚拟条件句，一般是条件用介词短语、分词短语或并列句的方式表达，这时主句的时态要求与含有条件从句的主句要求相同。四级测试中常考的含蓄虚拟条件句句型有：
        ① But for/Without, 主句
        But for/Without your help, we wouldn't have accomplished the task on time.
       
        ② ……, otherwise/or ……
        He hadn't had food for two days, or/otherwise he wouldn't have fainted out at work.
        上面2）题就属于该句型，表达的是与过去事实相反的情况，所以用would have telephoned的结构。
       
        ③ 分词/不定式，主句