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It is important to have a healthy lifestyle.

有个健康的生活习惯很重要。

It形式主语， to have a healthy lifestyle真实主语

is 谓语，important宾语

it is important to have a healthy lifestyle
拥有一个健康的生活习惯很重要
结构：主语+系动词+表语+状语

It is important to have a healthy lifestyle.
拥有一个健康的生活模式是（非常）重要的。
It is important to do的固定句型