表语从句&定语从句 一道选择题

Is this novel ___ you bought yesterday?
A that B where Cthe one D when

能选A吗？
老师说应该选C，是一个定语从句
选A行吗？翻译成：这本小说是你昨天买的吗？是不是构成了一个表语从句？

此题应选C选项，可以用还原法来解此题。
如：This novel is _____you bought yesterday.
这样很容易看出，是个：主+系+表语的句子。
1.理解为表语从句：This is what you bought yesterday.
因为表语从句you bought后没宾语，所只能用what来代替，并引导表语从句。意思是：这本小说就是你昨天买的东西。
疑问句：Is this novel what you bought yesterday?
意思是：这本小说就是你昨天买的东西吗？
2.理解为定语从句，补出引导词which,that.
This novel is _____ that/which you bought yesterday.
现在可以看出少先行词也就是this novel,还原来看。
This novel is this nove which/that you bought yesterday.
但此时，第二个this novel与第一个重复，为避免重复用the one代替。
This novel is the one which/that you bought yesterday.
关系代词作宾语时可以省略，去掉which/that还原成疑问句。
Is this novel the one you bought yesterday?
因此就只有选C选项了，如果有what也可选，但是作表语从句。

这一句，主句缺少表语，将题干还原未陈述句，this novel is______you bought yesterday.我们需要先把主句补充完整，才便于考虑后面的定语从句，填入的词需要充当主句的表语，也要充当从句的宾语，the one在这充当的是先行词，不是关系代词，the one后省略了关系代词that

不能选A。如果是定语从句，那么说明这一从句部分可以从句子中删去，这样就成了Is this novel?不符合英语语法，所以这一假设是错误的。而如果是表语从句，（1）that在后文中充当成分，但作为宾语的应该是what；（2）that不充当成分，那么从句成分完整。题目还原成陈述句应该是this novel is ___ you bought yesterday。缺少表语和连接词。同时，由语法可知这里的连接词是可以省略的，因此至少要填连接词，选项中可以充当连接词的只有C了。 PS：这种题目，一般做多了就有条件反射了。当然最好的方法还是多读英语文章，培养语感。

不能选a。c对。 c可以还原成this novel is 【the one特指】 you bought yesterday. 若是选a，还原后是this novel is 【that】 you bought yesterday.是错误的，正确的是this novel is 【what】 you bought yesterday. 若你想用that表达这句话，应该这样:this is 【the novel that特指】you bought yesterday. 怎么的a都不对。 注意体会这3句话的区别。