[It‘s] very important [to] keep [n good health. 为什么填 It’s、 和 to

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[It‘s] very important [to] keep [n good health. 为什么填 It’s、 和 to
[It‘s] very important [to] keep [n good health. 为什么填 It’s、 和 to

[It‘s] very important [to] keep [n good health. 为什么填 It’s、 和 to
It is + adj.+ to do Sth.句型

固定搭配 it's + adj.+ to

It’s adj. to do sth 形式主语的句式,固定用法

[It(形式主语)‘s系动词)] very important(表语) [to] keep [n good health(不定式短语做真正主语)
等于:
To keep in good health is very important 保持健康是非常重要的


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[It(形式主语)‘s系动词)] very important(表语) [to] keep [n good health(不定式短语做真正主语)
等于:
To keep in good health is very important 保持健康是非常重要的


【希望帮助到你,若有疑问,可以追问~~~
祝你学习进步,更上一层楼!(*^__^*)】

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It 为形式主语代替to keep in good health;本句是系表结构
主语为to keep in good health ,这是不定式结构,系动词为is,与形式主语一起缩写为It‘s,表语为very important