1、Unit4 Out of this worldGrammar & Usage1Learning Objectives:1. summarize the general rules of the form and the function of subject clause;2. Distinguish between the subject clause with other clauses;3. Use the subject clause to make a prediction about technological development.一、定义在主从复合句中充当主语的从句即为主语从
2、句。通常放在主句谓语动词之前或由形式主语it代替，真正的主语置于句末，使句子更平衡。What made people excited was that the solar ship had completed aroundtheworld trip.让人们激动的是太阳能船已完成了环游世界的旅行。It worried the woman that her son was always playing computer games.儿子一直在玩电脑游戏，这让这个女人很担心。二、基本用法1主语从句的引导词类别引导词说明从属连词that、whether两者在从句中均不作成分，只起连接作用；that无实
3、义，whether意为“是否”。连接代词what、which、who、whoever、whatever、whichever等在从句中作主语、宾语、表语、定语等成分。连接副词when、where、why、how等在从句中作时间、地点、原因、方式状语等成分。2it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系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系动词名词主语从句常用于此句型的名词有fact、idea、honour、q
4、uestion、pity等。It系动词动词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。三、应注意的问题1从句应用陈述语序How he succeeded is still a puzzle.2主谓一致(1)从句作主语时，主句的谓语一般用单数形式。Where he will get a job after graduation has puzzled him much.(2)如
5、果由and连接两个或两个以上的主语从句作主语时，谓语动词用复数；由两个或多个连接词引导一个主语从句时，谓语动词用单数。When they will start and where they will go have not been decided yet.When and where they will hold the meeting is not clear.单句语法填空1. will be in charge of the project is quite important.2. interested me most was how he escaped from New York and made his way to Miami. 3. Mr Green will return from China by plane or not hasnt been decided yet.
