为什么是It is imperative that this mission not fail.而不是It is imp

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/14 01:13:34

为什么是It is imperative that this mission not fail.而不是It is imperative that this mission don't fail.

Imperative “必要的,不可避免的；命令的,势在必行的"
像这样的词,后面接的句子谓语为“should + 动词原形”其中,should可以省略.
句子结构为：it's imperative that sb + (should)+ 谓语动词原形+其他成分

eg. 1. It was imperative that he (should) act as naturally as possible... 最重要的是他要做到尽可能自然.
2. It's imperative that he (should) not be seen here. 他不应该呆在这儿.

所以,这句话就可以为” It is imperative that this mission should not fail.当务之急是这个任务不能失败.
再问： It is imperative that this mission don't fail.那这么说对不对 It's essential that this mission not fail. be essential that 用虚拟语气是固定搭配还是这种BE+形容词+虚拟语气的句式都是这样的
再答：在主语从句中,谓语动词的虚拟语气结构用"should+动词原形"的结构,表示惊奇、不相信、惋惜、理应如此等。例如: It is necessary ( appropriate, crucial, desirable, dreadful, essential, important, improper, incredible, indispensable, insistent, natural, preferable possible probable proper right significant surprising strange tragic urgent vital wrong etc.) that we should clean the room every day. It was a pity (a shame,no wonder,etc.) that you should be so careless. It will be desired(suggested,decided,ordered, requested,proposed,etc.)t hat she should finish her homework this afternoon. 在上述三种主语从句中,should意为"应该"、"竟然",可以省去,但不可换用为其他形式。

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