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It is necessary……引导的句型后面什么时候用虚拟语气,什么时候用不定式

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A)It is necessary + that ... 的结构中的that引导主语从句的谓语动词要用虚拟语气,即 should + 动词原形,其中的should 可省略。

e.g. It is necessary that we (should) hold a meeting tomorrow.

B)在不定式作形容词的主语的句式中,It is necessary + 不定式

e.g. It is necessary for you to lock the car when you do not use it.