Are these your a set of keys?这个句子对吗,可以这样问吗,还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.

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Are these your a set of keys?这个句子对吗,可以这样问吗,还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.
Are these your a set of keys?这个句子对吗,可以这样问吗,
还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.

Are these your a set of keys?这个句子对吗,可以这样问吗,还有就是Is this her book?的回答为什么只能是No,it isn't.而不能是No,it is not.
（一）不能这样问.
1）人称代词后面是不能加冠词的,所以 a 不能放在 your 后面,应该把 a set of keys 放在 your 前面.
2）主语 a set of keys 是单数,所以不能用 are,要用 is.
此句应改成：Is this set of keys yours?
（二）两种回答都是正确的.

Are these your set of keys?
我觉得it is not也是对的

your 和a都是定冠词，不可连用
英语有很多是无法解释的，就像我妈，英语里就不能省略的字，只好记住了

Are these a set of keys of yours?
两种回答都对

楼上已经将问题一说清了。
其实你只要知道冠词和物主代词的作用都是标定名词的，所以二者取其一即可。
第二个问题中isn't和is not本质上没有区别。但它们的差异主要在口语中，用法不同，产生的效果有所差异。
在书面英语中，如果不是引述别人说的话，通常不使用缩写，既都写成is not形式。
在口语中is not表示的语气比isn't更加强烈。如果isn't用句号结尾，...

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