this is换he/she is,a set of keys换keys可以吗?

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this is换he/she is,a set of keys换keys可以吗?
为什么a set of keys是复数,下面一句却是is this your set of keys.is不是单数用的吗?什么情况下用at?什么情况下要换第三人称形式?什么单词前面要加the?什么情况下要使用宾格?we have four people in my family换my family have four people可以吗?英语中面条是可数名词吗?全部回答满意追加一定量分数

a set of是一套、一组的意思,后面的名词用复数形式；
下面的is是被a set of限制,这是一个单数形式；
如果是sets of,就用are；
专属名词前面用the；
如果句子中人称不做主语,就用宾格形式；
不可以换,my family是句子主语,它是单数形式,谓语动词只能用单数has；
noodle是可数名词,但它出现时,一般常用复数形式+s.

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