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英语语法反疑疑问如果插入了think等插入语则么判断最后的疑问句是否定还是肯定?

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英语语法反疑疑问如果插入了think等插入语则么判断最后的疑问句是否定还是肯定?
反疑疑问如果插入了think等插入语则么判断最后的疑问句是否定还是肯定?
我知道是要看主语的,但是如果是:
susan does not believe her son is able to design a digital camera ___
那主语算是susan还是her son?
一、若反意疑问句的陈述部分为I (we) think(believe,suppose,consider)+that 从句时,问句部分的助动词和主语与that从句内的动词和主语保持一致.
eg.1.I think that he has done his best,hasn't he?
2.We think that English is very useful,isn't it?
二、若反意疑问句的陈述部分为I (we)don't think(believe,suppose,con?鄄sider)+that从句时,从句为否定意义,问句部分的助动词和主语仍与that从句保持一致,用肯定形式.
eg.1.I don't think that you can do it,can you?
2.We don't believe that the news is true,is it?
三、反意疑问句的陈述部分为非第一人称主语+think (believe,suppose,consider)+that 从句时,问句部分的助动词和主语与陈述部分的助动词和主语保持一致.
eg.1.They all think that English is very useful,don't they?
2.He didn't think that the news is true,did he?