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。
http://m.ksjqmj.com/yingyuxuexi/9380.html
推荐访问