主语从句讲课课件.ppt

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 late. 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。 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. 3. 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。 It is necessary that the problem (should) be discussed at once. 立刻讨论这个问题很有必要。  4. 在It + be + suggested /advised/ordered/requested/ insisted/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。 It is suggested that more modern science and technology ____ textbooks. A. added to B. be added to C. is added to D. are added to 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. 1. _____ you don’t like him is none of my business. 2. _____ he said at the meeting astonished everybody present 3. ________ the 2000 Olympic Games will be held in Beijing is not known yet. 4. ________ we’ll go camping tomorrow depends on the weather. 5. ________ leaves the room last ought to turn off the lights. 2. It is pretty well understood ___ controls the flow of carbon dioxide in and out the atmosphere today. A. that B. when C. what D. how 3. ______ we will go