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1、Grammar What part does the underlined part serve as in each sentence A tree has fallen across the road You are a student To find your way can be a problem Smoking is bad for you How do you do is a greeting What she said is not yet known That we shall be late is certain It is certain that we shall be
2、 late Make sentences It s certain we ll be late Is he coming or not We don t know What does he want to tell us We don t know When will you come back It doesn t matter It s certain that we will be late That we ll be late is certain We don t know whether he is coming or not Whether he is coming is not
3、 known We don t know what he wants to tell us What he wants to tell us is not known When you will come back doesn t matter It doesn t matter when you will come back 主语从句 Noun Clauses as the Subject 定义 用作主语的从句叫主语从句 它是名 词性从句之一 引导主语从句的连接词有 连词that whether 连接代词who what和which 连接副词when where how和why 1 连接词
4、1 从属连词 that whether等 that 引导主语从句只起引导作用 本身 无实际意义 在主语从句中不充当任何 成分 但不能省略 That she left him cut him to the heart That he will come is certain 2 连接代词who what which whatever whichever whoever What seems easy to some people seems difficult to others Which side will win is not clear 由whether及其他连词引导的主语从句 放在句首
5、 句后都可 Whether it will please them is not easy to say 3 连接副词when where how why等 Why he did it remains a mystery When they will start is not known yet How he became a great scientist is known to us all 2 位置 主语从句可以前置 也可以 后置 用it做形式主语 而把主语从 句 在句末 常用下面几种句型 1 It be 表语 主语从句 表语 名词 形容词 过去分词 It is still uncert
6、ain whether he is coming or not It is an honour that I was invited to attend the meeting It is a fact a shame a pity good news that It is certain that she will do well in her exam It is true that I told her everything It is said that Mr Green has arrived in Beijing It is reported that China has sent
7、 another manmade earth satellite into orbit 2 It 不及物动词 主语从句 It seemed happened doesn t matter has turned out that It happens that they were absent It seems that Alice is not coming to the party at all It doesn t matter whether she will come or not It makes no difference where we shall have the meeti
8、ng 3 It 及物动词 被动语态 主语从句 It has been decided that the exhibition will not open on Sundays 注意 1 主语从句在句首时 必须由连接词引导 不能省略这些连接词 但是如果用it做形 式主语 而把主语从句放在句末时 从属连 词that可以省略 误 They should like each other is natural 正 That they should like each other is natural 正 It is natural that they should like each other 2 如
9、果主语从句放在句首 不能用if引导 但 是如果用it 做形式主语 而把主语从句放在 句末时 也可以用if引导 误 If Mary really heard him is really doubtful 正 It was doubtful if Mary really heard him 4 用于It is important natural necessary impossible that 句型中 主语从句应使用虚拟语气 谓语动词用 should 动 词原形 的形式 should有时可以省略 5 在It be suggested advised ordered requested insis
10、ted required 中 that从句的谓语也应该用 should 动词原形 的形式 should有时可以省略 5 5 主语从句需注意的问题主语从句需注意的问题 1 主语从句中用陈述语序 What she is afraid of is their taking her to Paris What is she afraid of Wrong 2 主语从句后谓语动词用第三人称单数 That they haven t phoned is strange 3 that引导的主语从句中 that不可被省略 That price will go up is certain 7 what 与that
11、 在引导主语从句时的 区别 what 引导主语从句时在句时在从句中充当 句子成分 如主语 宾语 表语 而that 则不 然 例如 1 What you said yesterday is right 2 That she is still alive is a consolation What在此引导主语从句 又做said的宾语 That 只起连接作用 不做成分 1 Where shall we spend the holiday isn t decided 2 You have made a mistake is a fact 3 That is certain that we can win 4 No matter who leaves the room last ought to turn off the lights 5 It is important that a student learns a foreign language we shall That you have It is Whoever should learn 改错练习 此课件下载可自行编辑修改 供参考 感谢您的支持 我们努力做得更好
