主语从句中的虚拟语气问题（一）
主语从句是一个重要的语法点，主语从句是中学阶段的重点语法项目,也是高考的热点之一。为使同学们更好地掌握其用法，和小编一起来看一下主语从句的虚拟语气问题吧！
it is important that…类句型中的主语从句用虚拟语气
在It is important that...句式中，其中由that引导的主语从句通常用“should+动词原形”这样的虚拟语气，其中的should在美国英语中通常省略。如：
It’s important that we (should) reply to her letter. 回复她的信是重要的。
It is important that we should speah politely. 我们说话要有礼貌，这是很重要的。
与本句型相似的还有以下句型：
1. it is necessary that…句型：
It is necessary that I should return it this morning. 今天早上我就有必要还回去。
It is not necessary that everyone be a scientist. 没有必要使每一个人都成为科学家。
2. it is impossible that…句型：
It is impossible that he should go home. 他不可能会回家去。
3. it is essential that…句型：
It is essential that the meeting start at eight. 会议务必在8点钟开始
It is essential that we should tell her the news. 我们有必要告诉她这个消息。
4. it is desirable that…句型：
It is desirable that everything should be ready by five o’clock. 最好一切在5点前准备就绪。
It is desirable that there should be a cold season once a year. 每年有一个寒冷的季节，是很令人盼望的。
5. it is advisable that…句型：
It is advisable that everyone should have a map. 最好每一个人都有一张地图。
It is advisable that he should see a dentist regularly. 他定期去看牙科医生是明智的。
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