英语语法：形式主语it构成的主语从句.docx

英语语法：形式主语it构成的主语从句 (1) 对于以连词that引导的主语从句，通常用形式主语代主语从句： It is important that he should know about this. 他必需知道此事 It’s vital that we be present. 我们出席是至关重要的 It was intended that you be the candidate. 大家的意图是让你当候选人 It is important that this mission not fail. 这项使命不失败至关重要 It is essential that a meeting be convened this week. 本周开一次会特别重要 It is appropriate that this tax be abolished. 废除这个税是恰当的 It’s unfair that so many people should lose their jobs. 竟有这么多人失业这是不公正的。

It’s amazing that she should have said nothing about it. 她竟未谈及此事令人惊异 It’s unthinkable that they should deny my request. 他们竟然拒绝我的恳求，这是不行思议的 (2) 对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句： It was a problem whether they would support us. 他们是否会支持我们还是一个问题 It remains to be seen whether it will do us harm or good. 它对我们是利是害，还得看看再说 (3) 对关系代词型what引导的主语从句，通常直接将主语从句放在句首如： What I want to know is this. 我想知道的就是这一点 有时也可将助用形式主语如： It is clear enough what he meant. 他是什么意思很清晰 (4) 假如句子是疑问句，则必需用带形式主语it的构造： Is it true that he is the girl’s father? 他是那女孩的父亲，是真的吗？ How is it that you are late again? 你怎么又迟到了？。