英语主语从句和表语从句的讲解及精选练习.docVIP

英语主语从句和表语从句的讲解及精选练习 名词性从句的功能相当于名词，分别在复合句中充当主语，表语，宾语和同位语，故被称作主语从句，表语从句，宾语从句和同位语从句。下面主要讲解主语从句和表语从句的用法。 主语从句的用法 引导主语从句的引导词有：连词that ,whether连接代词 who, what, which ,whose.连接副词when, where, how, why等。引导词的使用要看句意和所缺成分。 注意：从句作主语，谓语动词用单数，语序用陈述语序。表“是否”用“whether”, 陈述句莫忘加that. That light travels faster than sound is known to all.光比声音传播速度快是众所周知的。 When we shall have our sports meet is still a question.我们什么时候举行运动会还是个问题。 What we need is more practice.我们所需要的是更多的锻炼。 What we need are useful books. 我们所需要的是有用的书籍。 Which team will win is still unknown.哪个队会获胜还不知道呢。 Whether we’ll go camping depends on the weather.我们是否去野营取决于天气。 Whichever team wins on Saturday will go through to the national championships.无论哪一个队能在星期六获胜都将进军全国锦标赛。 常用it 作形式主语的含主语从句的句型： It is necessary \important\likely\possible\certain …+主语从句 It is a fact\ a pity\no wonder\our duty… +主语从句 It is said\reported\believed\thought\announced\hoped…+主语从句 It seems\ appears \ happened…+主语从句 例如： It is uncertain whether he has passed the examination.他是否已通过考试还不确定。 It’s a pity that you have to leave so soon.很遗憾你这么快就得离开。 It happened that I had no money with me. 碰巧我当时身上没带钱。 It has been proved that the copper knives came from places as distant as Spain and western France.事实已经证明，铜刀是来自像西班牙或法国西部那样遥远的地方。 高考例题： _______was most important to her, she told me, was her family.(2008山东) A. It B. This C. What D. As 分析：她告诉我对她来说最重要的是她的家庭。she told me是插入语，主语从句中缺少主语，故选What。答案为A. It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses in later life. (2008上海) A. if B. because C. when D. that 分析：已经证明童年时期多吃蔬菜有助于预防老年时一些重病的发生。It作形式主语，从句作真正主语，从句结构完整，不缺成分，故用连词that。答案为D. 表语从句的用法 表语从句在复合句中作主句的表语,一般置于系动词之后。引导表语从句的引导词有：连词that ,whether，as if连接代词 who, what, which ,whose.连接副词when, where, how, why等. 例如： This is where Lu Xun once lived.这就是鲁迅曾经住过的地方。 The question is whether the film is worth seeing.问题是这部影片是否值得一看。 This is why we put off the meeting. 这就是我们推迟会议的原因。 That’s what I want to say.我想说的就这些。