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反义疑问句Mrs Black doesn't believe her son is able to design a d

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反义疑问句
Mrs Black doesn't believe her son is able to design a digital camera,______?
A.is he B.isn't he C.doesn't she D.does she
(摘自某网页
八、反意疑问句的陈述部分为I(We) don’t think(believe, suppose, consider)+ that从句时,从句为否定意义,问句部分的动词和主语仍与that从句保持一致且用肯定式。如:
①I don’t think that you can do it, can you? (不用do I?)
②We don’t believe that the news is true, is it? (不用do we?)
这么说应该选B.isn't he ,可是答案是D.does she
反义疑问句Mrs Black doesn't believe her son is able to design a d
D does she
有个口诀叫 一从二三主,
意思是,主语是第一人称的时候,反义疑问词根据从句中的动词或情态动词来确定。比如你的(1),I don’t think that you can do it, can you? 因为主语已经是I don't...否定了,那么根据从句you can do it 那么反义疑问词用can,前面否定了,最终用can you?
同样的第二句例句We don’t believe that the news is true, is it?
口诀的二三主,意思是,主语是第二第三人称时,疑问词根据主句来确定,我举一个例子:She thought that he was the best student,didn't she?解释还是类似的、
明白了没?