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72. (28395-!-item-!-188;#058&003974) Several educational research groups are denouncing the mayor's proposal of a system by which individual teachers would be given raises or bonuses should it be that test scores show their students' mastery of reading skills having improved over a nine-month period.
(A) should it be that test scores show their students' mastery of reading skills having (B) should it be that test scores show their students' mastery of reading skills have (C) should test scores showing their students' mastery of reading skills has (D) if test scores showing their students' mastery of reading skills having (E) if test scores show that their students' mastery of reading skills has
A. should it be that结构错误，应为：should test scores show that…；that后面接的从句没有谓语
动词 B. should it be that结构错误；that后面接的从句主语为mastery，因此谓语应为单数has C. should位于句首引起虚拟语气下的条件状语从句，要是完整的句子，该句的showing应为show D. if条件状语从句没有谓语，showing应改成show E. 正确。
句子结构：Several educational research groups are denouncing the mayor's proposal of a system…为句子主结构。 by which引导从句修饰 proposal of a system. 该从句内部是一个带条件状语从句的复合句结构。
句子结构（Grammatical Construction）, 主谓一致（Agreement） 1) should引起虚拟结构，正确的表达方式应为should sth do…；if表如果作连词连接条件状语从句，连接完整的句子。 2) 注意区分复杂主语结构的核心词，使谓语动词单复数与其一致。
我这里有个疑问，既然是虚拟语气，为什么if从句中的动词时态没有变化，用的是非虚拟的形式呢？ 还有， teachers would be given praises 这里的would和什么对应；形式从何而来？ 求教大侠！ 谢谢！ | 
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发表于 2009-5-12 18:44:00
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