their favourite day is monday中文为什么要写their？ my favourite day is tuesday的问句...

MyfavouritedayisMondaywehavepEandcomputerdass\u8fd9\u53e5\u82f1\u8bed\u8fd9\u6837\u5199\u5bf9?

My favorite day is Monday because we have PE and computer class.
\u9700\u8981\u52a0\u8fde\u8bcdbecause \u8868\u793a\u56e0\u679c\u5173\u7cfb

\u4f60\u597d\uff0c\u5f88\u9ad8\u5174\u5728\u8fd9\u91cc\u56de\u7b54\u4f60\u7684\u95ee\u9898\uff1a
.
.
.

When is your favorite day?


What day is it today?

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因为 they是代词，
而 their 是物主性代词，
意思是：他们的/她们的

比如 我最喜欢的日子，
要用 my favourite day
不能用 I favourite day.
同理，
他们最喜欢的日子，
要用 their favorite day
而不是 they favorite day

形容词性物主代词后跟名词 day

Their favourite day is Monday.

他们最喜欢的是星期一。

回答和翻译如下：
their.
他们。
他们最喜欢的一天是星期一。

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