语法主语从句位置.ppt

名词性从句 名词性从句 主语从句 宾语从句 表语从句 同位语从句 主从复合句 主语从句可以前置，也可以后置。用it做形式主语，而把主语从句，在句末，常用下面几种句型。 1. It + be + 表语 +主语从句 表语：（名词， 形容词，过去分词） 位置 It is said that Mr. Green has arrived in Beijing. It is reported that China has sent another manmade earth satellite into orbit. 2. It+不及物动词+主语从句 It seemed (happened, doesn’t matter, has turned out) that… It happens that they were absent. It seems that Alice is not coming to the party at all. It doesn’t matter whether she will come or not. 3. It +及物动词（被动语态）+主语从句 It has been decided that the exhibition will not open on Sundays. 1）主语从句在句首时，必须由连接词引导，不能省略这些连接词；但是如果用it做形式主语，而把主语从句放在句末时，从属连词that可以省略。 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. (1)主语从句中用陈述语序 What she is afraid of is their taking her to Paris. ( What is she afraid of … Wrong ) (2)主语从句后谓语动词用第三人称单数 That they haven’t phoned is strange. (3)that引导的主语从句中，that不可被省略 That price will go up is certain. 主语从句需注意的问题