高一英语必修3 Unit4主语从句课件.ppt

Unit 4 Period 4 主语从句,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。,DISCOVERING USEFUL STRUCTURES P. 29,用法：,1) 由what等代词引起的主语从句： What the teacher said today was quite right. 老师今天说的话是十分正确的。,2) 由连词that引起的主语从句： That they are badly in need of help is quite clear. 他们急需帮助，这是十分明显的。 但是这类句子在大多数情况下会放到整个句子的后部去，而用代词it作形式主语。,3) 由连接代词或连接副词以及whether引起的主语从句。 Whether they will sell the house is not yet decided. 他们是否卖掉这所房子还没有决定。,4) whatever, whoever也可引导主语从句。 Whatever was said here must be kept secret. 这里说的话都应当保密。 Whoever makes mistakes must correct them. 凡犯了错误的人都必须改正。,注意: 上述例句中的主语从句都是放在句首, 但有时为了使句子结构平衡, 避免 “头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。 例如: It is a pity that she has made such a mistake. 她犯了这样一个错误, 真是遗憾。,这样就构成了下面一些常用句型: 1) It is + adj. / n. +从句 It is a pity/shame that. 遗憾的是 It is possible that. 很可能 It is unlikely that. 不可能 2) It +不及物动词+从句 It seems/appears that. 似乎 It happened that. 碰巧,3) It + be +过去分词+从句 It is said that. 据说 It is known to all that. 众所周知 It is reported that. 据报道 It is believed that. 据信;人们相信 It is suggested that. 有人建议,It must be pointed out that. 必须指出 It has been proved that. 已证明. 如: It is believed that at least a score of buildings were damaged or destroyed. 据信, 至少有二十座楼房遭到破坏或彻底毁掉。,5) . 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有时有感情色彩。,1. _ you dont 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. _ well go camping tomorrow depends on the weather. 5. _ leaves the room last ought to turn off the lights.,That,What,Whether,Whether,Whoever,填空。,6. _ is a fact that English is being accepted as an international language. 7.It worried her a bit _ her hair was turning grey. 8. The Foreign Minister said, “_ is our hope that the two sides will work towards peace.” 9. After Yang Liwei succeeded in circling the earth, _ our astronauts desire to do is walk in space.,It,that,It,what,1. After Yang Liwei succeeded in circling the earth, _ our astronauts desire to do is walk in space. (2004 上海 37) A. where B. what C. that D. how,解析: what 引导主语从句,在从句中做do 的宾语,高考链接,2. The other day, my brother drove his car down the street at _ I thought was a dangerous speed. (2004 上海 春 38) A. as B. which C. what D. that,解析: I thought 是插入语,可以把它去掉不考虑. what 引导宾语从句,在从句中作主语.宾语从句作at的宾语.,3. _ in the regulations that you should not tell other people the password of your email account.（2005 上海-38） A. What is required B. What requires C. It is required D. It requires,解析: “It is required that ”是一个固定句式，it作形式主语, that引导的从句为真正的主语。,4. _ the 2000 Olympic Games will be held in Beijing is not known yet. 高考真题 A. Whenever B. If C. Whether D. That,答案是C。“2000年奥林匹克运动会是否在北京举行还不知道。”,5. _ he said at the meeting astonished everybody present. 高考真题 A. What B. That C. The fact D. The matter,答案是C。“他在会上的发言使到会的每一个人都感到惊讶” what 表示“(所说的话)” ,相当于The words (that + /which) he said at the meeting,6. _ leaves the room last ought to turn off the light. 高考真题 A. Anyone B. The person C. Whoever D. Who,答案是C。“谁最后离开房间应关灯。”whoever意为“无论谁”, 引导主语从句, 并在从句中作主语。若选A或B, anyone或the person 后应回who, 使其成为由who引导的定语从句, 修饰anyone 或person. 注：这些词还可引导副词性从句。,7. _ he has become a rich man is known to all in our town. 高考真题 A. Because B. That C. / D. What,答案是B。“他变成了富翁, 这是我们镇上下班人人皆知的事。”根据句意, 须用that 引导的主语从句。that 在从句中不担任任何成分, 只起连接作用.,8. _ I need is more time. A. That B. What C. / D. Which,答案是B。“我所需要的是更多的时间。” 根据题意, 应选what 引志的主语从句, what在职从句中作宾语(what = the thing which).主语从句的关联词不能省略, 故排除C。which 表示“哪