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4个简单英语句子的语法疑问.

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4个简单英语句子的语法疑问.

Don't let the children stay up too late on weekends,will you?
Don't let the children eat a lot of sweets,shall we?
这组句子后面的附近疑问词为什么会不同?语法书说不是只有let's的时候才用shall 期待您的解答.

She had her hair cut the day before yesterday,didn't she?
You had your watch repaired yesterday,hadn't you?
这2个句子,看不出来结构上有什么不同.为什么它们的附近疑问部分,会不同呢?
Why are unit nouns especially useful when they are used to modify a mass noun?
请问这句话中的 unit nouns,以及 mass noun,
4个简单英语句子的语法疑问.
(you) Don't let the children stay up too late on weekends,will you?
这句说话祈使的对象是you,所以用will you
(we) Don't let the children eat a lot of sweets,shall we?
祈使对象是we,包括说话人,所以用shall we
She had her hair cut the day before yesterday,didn't she?
You had your watch repaired yesterday,hadn't you?
结构一样,照理说第二个应该用didn't you 因为两句中的had都是have得一般过去式,反义疑问句应借助助动词did
unit nouns单位名词 mass noun物质名词
楼主是否明白?