They don’t work on Saturdays and Sundays.为什么用don’t来否定

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• They don’t work on Saturdays and Sundays.为什么用don’t来否定
• He thinks his aunt is right.(改为反意疑问句） He thinks his aunt is right.____ ____?我认为应该是：isn't she 是对aunt来做答,并且是否定的,但是正确答案是doesn't he,请问为什么用doesn't 而不是isn't 刚才有人回答对he think提的反意疑问,所以是doesn't he,这个我能理解,可是我看到一个规则,就是I think/know/believe/guess/等词汇,要根据后面的that从句来形成反意疑问句的,还举了三个例子,我就是根据 这个两个例子来做的上面这道题,例1：I know that you don't want to hurt me.do you?例2：I believe that he will try his best.won't he 例3：I don't think that we can spend so much money on clothes,can we?我想问到
• They don't work on Saturdays and Sundays.为什么否定句用and?
• They don’t work on Saturdays and Sundays.为什么用don’t来否定Saturdays和Sundays后面为什么加s?
• They don't work on Saturdays and Sundays.为什么否定句用and?
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