"they are their" 这个表达 是不正确的。在这个结构中,“their”是形容词性物主代词,后面应该接名词,而“they”是主语。正确的表达应该是“they are their parents”或者“Are they their books?”。在这个结构中,“they”作为主语,“are”作为系动词,而“their”作为形容词性物主代词修饰后面的名词。
总结:
“they”是主语。
“their”是形容词性物主代词,后面需要接名词。
正确的表达应该是“they are their [名词]”或者“Are they their [名词]?”。
因此,“they are their”是不正确的,应该改为“they are their [名词]”或者“Are they their [名词]?”。
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