It is no use arguing about it.争吵是没用的。(It为arguing about it的形式主语)
It is uncertain who will come.谁要来还不确定。 (It为who will come的形式主语)
It 作形式主语的常见句型:
①It+be+形容词+to do sth./doing/ that...
(形 容 词 常 为necessary/clear/natural/essential/urgent/important/
impossible/possible/probable/likely/wellknown/strange,其中necessary,natural,important,strange等词后从句应用should do。)
It is very important to learn a foreign language.
I t is very important that we should learn a foreign language well.学一门外语非常重要。
It is useless crying over the spilt milk.覆水难收。
It was really surprising that she married a man like that.
她嫁给那样的男士真让人惊讶。
②It+be+名词词组+doing/that...
(名词词组常为a fact/pity/shame/question/custom,our hope,no wonder,good/bad manners,common knowledge)
It is no good telling lies.撒谎没好处。
It is a pity that you didn’t go to see the film yesterday.
你昨天没看成那部电影真遗憾。
It is a truth that there would be no new China without the Communist Party.
没有共产党就没有新中国,这是毋庸质疑的。
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