the girl in a red skirt must be sally,( ) she?构成反义疑问句、

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the girl in a red skirt must be sally,( ) she?构成反义疑问句、

the girl in a red skirt must be sally,( ) she?构成反义疑问句、
the girl in a red skirt must be sally,( ) she?
构成反义疑问句、

the girl in a red skirt must be sally,( ) she?构成反义疑问句、
当must表示推测的时候,翻反义疑问句要根据must后面的be的真实情况,这句活明显是一般现在时态,所以正常来说是the girl in a red skirt is sally,must是推测的词,不能用must,这是语法规定.

isn't

反问句 isn't 意为 不是么?

isn't

mustn't

is

isn't 因为这里前面是对于现在事情的肯定猜测,在这种情况下应与must后动词在非推测情况下的一致,也就是说,the girlin red skirt is Sally。这句话的反义疑问句就是isn't it?

isn't she

Isn't she?

http://wenku.baidu.com/view/9d891d1bfc4ffe473368abe2.html
个人觉得这个讲的还是挺好的,可以看一下must的三种反义疑问句的用法