“It is essential that” 用法详解

在英语中,“It is essential that...” 是一个常见的表达结构,用于强调某事的必要性或重要性。 此结构后接的从句通常使用虚拟语气(subjunctive mood),即动词使用原形(不随主语变化)。

基本结构

It is essential that + 主语 + 动词原形 + 其他成分

✅ 正确:
It is essential that he be on time.
(他准时是必要的。)

❌ 错误:
It is essential that he is on time.

为什么用动词原形?

这是因为在正式英语中,表示建议、要求、命令、必要性等含义的形容词(如 essential, important, necessary, vital, crucial 等) 后接的 that 从句需使用虚拟语气。动词不受主语人称和数的影响,一律用原形。

更多例句

口语中的变体

在非正式英语(尤其是英式英语)中,有时会用 “should + 动词原形”:

It is essential that he should be informed.

但在美式英语和正式写作中,更推荐直接使用动词原形。

常见错误提醒

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