2024年初中英语语法专项学习之主语从句与宾语从句区别

2024年初中英语语法专项学习之主语从句与宾语从句区别 　　主语从句与宾语从句两者的用法和在句中的作用是不同的，下面从它们的各自用法来介绍。 　　一．主语从句 　　主语从句 定义：在句子中担当主语的是一个从句，这个从句就叫做主语从句。 主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。 1. It 作形式主语和it引导强调句的比较 ①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句例如： It is still a question whether she will come or not. It is strange that you should like him. It is still unknown which team will win the match. 另外，还有一些比较多见的结构： It turned out that……; It has been proved that……; It happened/occurred that……; It is well-known that……等等 ②而强调句则不同，它的结构是：It+be+被强调部分+that+从句 强调主语：It is the times that produce their heroes.时势造英雄 强调宾语：It is English that Prof.Lin teaches us. 强调状语：It was in shanghai that I saw the film. 　　判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。 　　2. 用it 作形式主语的结构 (1) It is +名词+that从句 It is a fact that … 事实是…… It is an honor that …非常荣幸 It is common knowledge that …是常识 (2) it is +形容词+that从句 It is natural that… 很自然…… It is strange that… 奇怪的是…… (3) it +不及物动词+that从句 It seems that… 似乎…… It happened that… 碰巧…… (4) it is+过去分词+that从句 It is reported that… 据报道…… It has been proved that… 已证实…… 3.主语从句不可位于句首的五种情况 (1) if 引导的主语从句不可居于复合句句首。 (2) It is said , (reported) …结构中的主语从句不可提前。例如： It is said that President Jingo will visit our school next week. (3) It happens…, It occurs… 结构中的主语从句不可提前。例如： It occurred to him that he failed in the examination. (4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如： It doesn’t matter whether he is wrong or not. (5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如： Is it likely that it will rain in the evening 4. What 与that 在引导主语从句时的区别 What 引导主语从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： What you said yesterday is right. 主语从句： 在复合句中充当主语成分的句子叫做主语从句。常规主语从句，即句子在复合句中充当一个主语。 主语从句的时态：不受主句的时态影响和限制。 例如： That he finished writing the composition in such a short time surprised us all. What we need is time. It is certain that he will win the match. (1) 引导主语从句连词有that,whether,who,what,whatever等 　　 (2) 连词位于句首不能省略 　　 (3) 主语从句大多数情况下视为第三人称单数 在复合句中充当主语成分的句子叫做主语从句。常规主语从句，即句子在复合句中充当一个 主语。 主语从句的时态：不受主句的时态影响和限制。 例如： That he finished writing the composition in such a short time surprised us all. What we need is time. It is certain that he will win th ... ...