Unit4 主语从句课件 必修3

Unit 4 Astronomy: the science of the stars

Grammar The subject clause

4. 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.

4. It 作形式主语和it引导强调句的比较It 作形式主语代替主语从句，主要是为了平衡句子结构， 主语从句的连接词没有变化。而it引导的强调句则是对句 子某一部分进行强调，无论强调的是什么成分，都可用连 词that。被强调部分指人是也可用who/whom。例如： It is a pity that you didn’t go to see the film. It doesn’t interest me whether you succeed or not. It is in the morning that the murder took place. It is John that broke the window.

5. what 与that 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.It is right what you said yesterday. ×

2) That she is still alive is a consolation.It is a consolation that she is still alive. √

改错练习1.Where shall we spend the holiday isn’t decided. we shall 2.Your have made a mistake is a fact. That you have3.That is certain that we can win. It is 4.No matter who leaves the room last ought to turn off the lights. Whoever 5.It is important that a student learns a foreign language. should learn

1. _____ we need more practice is quite obvious. A. What B. That C. When D. / 2. _______ they can solve the question is still unknown. A. If B. Which C. Whether D. What 3. _____ he said at the meeting astonished everybody. A. Why B. What C. That D. Who 4. ____ is a fact that English is accepted as an international language. A. There B. This C. That D. It