It's impolite not being able to get to the appointed place on time.语法结构是怎样的

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It's impolite not being able to get to the appointed place on time.语法结构是怎样的

It:形式主语,代替后边的“not being able to get to the appointed place on time”
is:谓语
impolite:表语
not being able to get to the appointed place on time:真正主语
原句翻译:不能按时到达约定地点是很不礼貌的.

it形式主语,
be impolite系动词+表语
not being able to get to the appointed place on time真正主语
appointed定语
not being able to ...是动名词的否定式
不能及时到约定的地方是不礼貌的。

这句是it's + adj. + to do sth, 的结构;
It 形式主语
is 谓语
impolite 表语
not being able to get to the appointed place on time. 真正主语