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高二英語Unit5語法知識(shí)點(diǎn)是主語從句，主語從句指在復(fù)合句中充當(dāng)主語成分的句子，在主句中不要求做何成分。 一、引導(dǎo)主語從句的連詞主要有： 從屬連詞：that whether 連接代詞：who whoever whom whose what whatever which whichever 連接副詞：when where how why 二、用法 主語從句是在復(fù)合句中充當(dāng)主語的從句，通常放在主句謂語動(dòng)詞之前或由形式主語it代替，而本身放在句子末尾。 1. It 作形式主語和it引導(dǎo)強(qiáng)調(diào)句的比較 ①主語從句常用it作形式主語，一般常用句型為：It is+{名詞/形容詞/過去分詞}+主語從句例如： 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，還有一些比較多見的結(jié)構(gòu)： It turned out that……; It has been proved that……; It happened/occurred that……; It is well-known that……等等 ②而強(qiáng)調(diào)句則不同，它的結(jié)構(gòu)是：It+be+被強(qiáng)調(diào)部分+that+從句 強(qiáng)調(diào)主語：It is the times that produce their heroes.時(shí)勢造英雄 強(qiáng)調(diào)賓語：It is English that Prof.Lin teaches us. 強(qiáng)調(diào)狀語：It was in shanghai that I saw the film. 判斷是否是強(qiáng)調(diào)句有一個(gè)方法，就是將that以后的“句子的其余部分”拿出來單獨(dú)看，看有沒有缺成分，缺的是什么成分，再把謂語動(dòng)詞后面that前面的那部分，帶到你認(rèn)為缺成分的地方，如果放進(jìn)去是一句完整的句子了，那就說明是強(qiáng)調(diào)句。 2. 用it 作形式主語的結(jié)構(gòu) (1) It is +名詞+that從句 It is a fact that … 事實(shí)是…… It is an honor that …非常榮幸 It is common knowledge that …是常識(shí) (2) it is +形容詞+that從句 It is natural that… 很自然…… It is strange that… 奇怪的是…… (3) it +不及物動(dòng)詞+that從句 It seems that… 似乎…… It happened that… 碰巧…… (4) it is+過去分詞+that從句 It is reported that… 據(jù)報(bào)道…… It has been proved that… 已證實(shí)…… 3.主語從句不可位于句首的五種情況 (1) if引導(dǎo)的主語從句不可居于復(fù)合句句首。 (2) It is said , (reported) …結(jié)構(gòu)中的主語從句不可提前。例如： It is said that President Jingo will visit our school next week. (3) It happens…, It occurs… 結(jié)構(gòu)中的主語從句不可提前。例如： It occurred to him that he failed in the examination. (4) It doesn’t matter how/whether …結(jié)構(gòu)中的主語從句不可提前。例如： It doesn’t matter whether he is wrong or not.. (5) 含主語從句的復(fù)合句是疑問句時(shí)，主語從句不可提前。例如： Is it likely that it will rain in the evening? 4. What 與that 在引導(dǎo)主語從句時(shí)的區(qū)別 What 引導(dǎo)主語從句時(shí)在從句中充當(dāng)句子成分，如主語.賓語.表語，而that 則不然。例如： What you said yesterday is right. 三、賓語從句用以區(qū)分主語從句的幾個(gè)特征 1、引導(dǎo)詞：whatwhichwhosewhenwhetherifwhere 2語序：賓語從句必須是用陳述語句。(名詞性從句都是陳述語序) 如：I think that you must work harder. 賓語從句的引導(dǎo)詞、連接詞的區(qū)別、否定轉(zhuǎn)移等現(xiàn)象。 補(bǔ)充：從句的語序永遠(yuǎn)是陳述句。 |
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