Period 3 Grammar and usage—Subject clauses 请认真阅读下列句子，感悟体会主语从句并完成方框下的小题。 1．What I want to know is his arrival time. 2．Whether they would support us was a problem. 3．It was a pity that you didn’t go to the talk. 4．That everyone may receive at least a moderate education is significant. 5．Whoever wants to reach a distant goal must take many small steps. [自主发现] 1．句1～5中，黑体部分均为_____从句。 2．句3中，It作_____，真正的主语是后面that引导的从句。 一、定义 在主从复合句中充当主语的从句即为主语从句。 What made people excited was that the solar ship had completed around the world trip. 让人们激动的是太阳能飞艇已完成了环球旅行。 It worried the astronaut that her niece was always playing computer games. 侄女经常玩电脑游戏，这让这名宇航员很担心。 二、基本用法 (一)主语从句的引导词 1．连接词that和whether/if (1)that在从句中不充当任何句子成分，本身无任何意义，只起连接作用，但不可省略。 That the astronomers survived the accident in the circumstances is a miracle. 在这种情况下，天文学家们在事故中幸存下来简直是个奇迹。 (2)whether/if在从句中不充当任何句子成分，起连接作用，意为“是否”，不可省略。 Whether the radiation will be controlled is still unknown. ＝It is still unknown if/whether the radiation will be controlled. 辐射是否会得到控制还是未知的。 2．连接代词(who，whose，whom，what，which，whichever，whoever，whomever，whatever等) 连接代词引导主语从句，在从句中可以作主语、宾语、表语或定语。 Whoever (of you) comes in first will be admitted by this agency. 无论(你们中的)谁获得第一名都将被这家机构录取。 Who will be in charge of the administration is plain to see. 谁将负责这个行政部门是显而易见的。 Whatever you do in your spare time should do no harm to others. 无论你在空闲时间做什么都不能伤害其他人。 3．连接副词(when，where，how，why等) 连接副词引导主语从句，在从句中作状语。 How this mission was accomplished is not clear to anyone. 这个任务是怎么完成的，谁也不清楚。 When we will have a meeting is an important question. 我们何时举行会议是个重要的问题。 Where the treasure was buried is still a puzzle. 财宝埋在哪里仍然是个谜。 [点津] 主语从句中引导词的选择技巧： (1)分析连接词在从句中所作的句子成分； (2)分析从句的意义。 (二)it作形式主语 为保持句子平衡，常把主语从句后置，而用形式主语it代替。it作形式主语时常用于以下句型： 句型 说明 It＋be动词＋形容词＋主语从句 常用于此句型的形容词有important，(un)likely，possible，necessary，natural，wrong等。 It＋be动词＋名词＋主语从句 常用于此句型的名词有fact，idea，honour，question，pity等。 It＋be动词＋动词 ed形式＋主语从句 常用于此句型的动词 ed形式有known，proved，said，decided，suggested，thought，believed等。 It＋不及物动词＋主语从句 常用于此句型的不及物动词有appear，happen，seem，occur，matter等。 It’s possible that he has passed the driving test. 他有可能通过了驾照考试。 It’s a pity that he didn’t catch the first bus. 他没赶上头班车，太可惜了。 It seems that it is going to rain. 看起来好像要下雨。 [点津] (1)在“It＋be动词＋动词 ed形式＋主语从句”结构中，动词 ed形式若为suggested/ord ... ...
