请就这道题给我讲一下独立主格结构.It__ a hot day,I decided to go for a swim.此处为何不能填is?而只能用being?

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请就这道题给我讲一下独立主格结构.It__ a hot day,I decided to go for a swim.此处为何不能填is?而只能用being?

请就这道题给我讲一下独立主格结构.It__ a hot day,I decided to go for a swim.此处为何不能填is?而只能用being?
请就这道题给我讲一下独立主格结构.It__ a hot day,I decided to go for a swim.此处为何不能填is?
而只能用being?

请就这道题给我讲一下独立主格结构.It__ a hot day,I decided to go for a swim.此处为何不能填is?而只能用being?
填is,前后为两个独立的句子,两独立的句子,前后必须有连词连接,而本句无连词.

这个 就相当于 For it is a hot day。。。。