主语从句 主语从句完整讲解


主语从句 主语从句完整讲解

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大家好,小龙来为大家解答以上的问题 。主语从句完整讲解 , 主语从句这个很多人还不知道,现在让我们一起来看看吧!
1、主语从句 一、概述:在句子中起名词作用的各种从句统称为名词性从句 。
2、根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句 。
3、 二、 几个共性问题: 1.连接方式 (1) 在由连词that, whether, if引导的名词性从句中 , 引导词在句中不做成分,在宾语从句和表语从句中,that可以省略 。
4、 (2) 在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中,其连接代词在句中起名词性作用,担当一定成分 。
【主语从句 主语从句完整讲解】5、 (3)在由连接副词when, where, why, how引导的名词性从句中,其连接副词在句中作状语 。
6、 2.whether和if的区别 (1)whether在引导的主语从句中可以置于句首,而if则不能 。
7、 (2)whether可以与or not连用,or not可以紧跟在whether之后 , 也可以置于从句末尾;if一般不能和or not连用 。
8、 (3)表语从句、同位语从句和介词宾语从句(即在系词be和介词之后),只能用whether连接,而不用if 。
9、 (4)从句是否定式时,一般用if, whether很少用在否定式从句中 。
10、 例如:I don’t care if he doesn’t come . 如果他不来,我也不介意 。
11、 The problem is whether we can carry out the plan. 问题是我们是否能实施这项计划 。
12、 三、 主语从句 1.主语从句主要有三类: (1) 由连词that引导的主语从句 。
13、 例如:That you will win the medal seems unlikely. 你想获得奖牌看起来是不可能的 。
14、 That you are so indifferent bothers me. 你如此冷淡使我很烦恼 。
15、 That she survived the accident is a miracle. 她在事故中幸免于难简直是奇迹 。
16、 (2) 用连接代词或连接副词if, whether 引导的主语从句 。
17、 例如: Which of them escaped from the prison is still a mystery. 他们哪一个是从监狱里逃跑的 , 仍然是个谜 。
18、 When they will come hasn’t been made pubic. 他们什么时候来还不知道 。
19、 Whether she is coming or not doesn’t matter too much. 她来不来都无关紧要 。
20、 (3) 用关系代词引导的主语从句 。
21、 例如:What you need is more practice. 你所需要的是更多的训练 。
22、 What I want to know is this. 我想知道的就是这事 。
23、 Whatever we do is to serve the people. 我们无论做什么都是为人民服务 。
24、 主语从句可以直接放在主语位置上,也可以用it作形式主语,而将从句放在句末(尤其是当谓语较短时) 。
25、 例如:That light travels in straight lines is known to all. 光沿直线传播 , 这是众所周知的事 。
26、 =It is known to all that light travels in straight lines. 众所周知光沿直线传播 。
27、 When the plane is to take off has not been announced . 飞机何时起飞还没有宣布 。
28、 = It has not been announced when the plane is to take off. 还没有宣布飞机何时起飞 。
29、 当what引导的主语从句表示“…的东西”时 , 一般不用it作形式主语 。
30、 错:It is a book what he wants. 对:What he wants is a book. 他想要的是本书 。
31、 如果带主语从句的句子是疑问式,则必须用it作形式主语的结构 。
32、 例如:Has it been settled who will be sent to carry out the task ? 谁将被派去执行这项任务决定了吗 ? 3.固定用法和译法 (1) It is +名词+从句 It is a fact that… 事实是…… It is good news that … ……是好消息 It is a question that … ……是个问题 It is common knowledge that … ……是常识 类似的名词还有:a pity;a wonder;a good thing; no wonder; surprise等 。
33、 例如:It is a mystery to me how it all happened. 这一切是怎么发生的是个谜 。
34、 It is common knowledge that the whale is not a fish. 鲸鱼不是鱼,这是常识 。
35、 It is no surprise that Bob should have won the game. 鲍勃会赢得这场比赛,这不足为奇 。
36、 (2) It is +形容词+从句 It is necessary that … 有必要…… It is clear that … 很清楚…… It is likely that … 很可能…… It is important that … 重要的是…… 类似的形容词还有:strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. 例如:It is obvious that conductors and insulators are both important in industry. 很明显导体和绝缘体在工业中都很重要 。
37、 It is doubtful whether she will be able to come. 她是否能来令人怀疑 。
38、 It was really astonishing that he refused to talk to you . 他拒绝和你说话真是令人惊讶 。
39、 It is essential that he should be here by the weekend . 周末之前 , 他应该到这里是必要的 。
40、 It seems obvious that we can not go on like this. 很明显我们不能这样下去了 。
41、 (3) It is +过去分词+从句 It is said that … 据说…… It is reported that … 据报道…… It has been proved that … 已证明…… It must be proved that… 必须指出…… 类似的过去分词还有:known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc. 例如:It is thought that he is the best player. 大家都认为他是最好的选手 。
42、 It is estimated that the vase is 2000 years old. 据估计这个花瓶有2000年的历史 。
43、 It is used to be thought that a new star must be due to a collision between two stars. 过去一直认为新星是由于两颗星星之间碰撞产生的 。
44、 It has not been made clear when the new road is to be opened to traffic. 还没弄清楚这条路将开始通车 。
45、 (4) It +不及物动词+从句 It seems that … 好像是…… It happened that… 碰巧…… It follows that … 由此可见…… It has turned out that … 结果是…… 类似的不及物动词还有:seem, appear, occur, follow, happen, turn out, etc. 例如:It turned out that nobody remembered the address. 结果是无人记得那个地址 。
46、 It now appears that they are in urgent need of help. 看起来他们急需帮助 。
47、 It does not matter if I missed my train, because there is another later. 没有赶上这趟火车没有关系 , 稍晚还有一趟 。
48、 It happened that I saw him yesterday. 碰巧我昨天看见他了 。
49、 当“及物动词 + 宾语”较短时,也可用这种结构 。
50、 例如:It shocked me that Peter did not tell anybody where he was. 让我吃惊的是彼得没有告诉任何人他在哪里 。
51、 It does not interest me whether you go or not. 我对你去不去不感兴趣 。
52、 It +某些固定结构+ 主语从句 。
53、 例如:It doesn’t make too much difference (It doesn’t make any difference / It doesn’t alter the situation),whether it rains or not . 下不下雨都没有多大关系 。
54、 It does not make any difference whether it rains or not . 下不下雨没什么分别 。
55、 It does not make the least difference to me what you do. 对我来说你做什么都无关紧要 。
56、 Is it of much consequence to you that Mr. Wang has failed to do it ? 王先生没有做成这件事对你有什么重要影响吗? 。
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