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1、Lesson1Lesson1It It 做形式主语的用法做形式主语的用法content0101概念概念02类型类型03练习练习04总结总结It It 做形式主语做形式主语To finish the homework is difficult.系动词 主 语表语To finish the homeworkdifficultis导入导入.To finish the homeworkisdifficultItIt is difficult to finish the homework.To finish the homework真正的主语形式上的主语导入导入知识讲解一、概念一、概念形式主语it是为满
2、足语法上的需要，为避免句子头重脚轻而使用的。它代替的是句子的逻辑主语。作为形式主语的it并无实际语义。牛刀小试牛刀小试一、把下列的句子变成用it的形式主语句。 1. To say goodbye is difficult for me. It is difficult for me to say goodbye . 2. Playing too many computer games is a waste of time. It is a waste of time playing too many computer games.It is obvious that he is clever.
3、 3.That he is clever is obvious. 课堂练习二二. . 常见类型常见类型1.It做形式主语，不定式做真正的主语2. It做形式主语，动名词做真正的主语3. It做形式主语，名词性从句做真正的主语It做形式主语知识讲解注意：1. 该句型中的形容词可以是：kind. good、nice、wise、polite、cruel、rude、selfish等形容人的品行、性格的词，此时不定式to do sth 前应用of sb. of sb.1. It做形式主语， 不定式做真正的主语It is/was+adj/n+ for sb.+to do sthTo finish the
4、homework is difficult for me.It is difficult for me to finish the homework. 2. 另外，若该句型中的形容词是：necessary、important、difficult、easy、possible、hard、等形容某个人做某件事是怎么样的情况，此时不定式to do sth 前应用for sb. e.g：It is kind of you to help me.e.g: It is difficult for me to finish the homework.知识讲解注意：1. 该句型中的名词可以是：a pity、a
5、shame、a good idea、a pleasure、a hard job等，此时不定式to do sth 前应用for sb. of sb.1. It做形式主语， 不定式做真正的主语It is/was+adj/n+ for sb.+to do sthTo finish the homework is difficult.It is difficult to finish the homework.e.g：It is a pity for me to lose the game.知识讲解1. It做形式主语， 不定式做真正的主语知识讲解It takes/took sb+some time/
6、money+to do sthIt took me an hour to finish my homework yesterday.111.it作为形式主语代替不定式(1)It is+adj for/of sb+to do sth(2)It is+n+to do sth(3)It takes/took sb+sth+to do sth常见的句型有: 1. It is no use（good） doing sth. 2. It is useless doing sth. 3. It is pleasure doing sth. 4.It is worth doing sth. 5. It is
7、a waste of time doing sth. 6. It is fun doing sth.等等 2. It2. It做形式主语，动名词做真正的主语做形式主语，动名词做真正的主语如：It is useless thinking too much.It is no good thinking too much.知识讲解It is a waste of time playing too many online games.It is no use asking him for help.1.It +is/was +adj (如：obvious/possible/likely/natural
8、等)+从句3. It做形式主语，名词性从句做真正的主语e.g: It is said that youre wrong.2. It+ is/was +n(如：a pity/ a shame/a fact/an honor/a good idea等）+从句e.g: It is a pity that youre wrong.3. It +is/was +过去分词（如：reported/said/believed/announced等)+ 从句 e.g: It is sad that youre wrong.4. It+不及物动词（如：seem/happen/turn out/occur等）+从句
9、e.g: It seems that youre wrong.知识讲解三、练习三、练习一、以下句子均有一处错误，请找出来并改正。 1. That is hard to find a good job.2. It is necessary of you to study hard.3. It is no use to be sad. 4. It is very rude for you to speak loudly in public. Itofbeingfor课堂练习四、小节四、小节形式主语it是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的逻辑主语。作为形式主语的it并无实际语义一、概念一、概念1.不定式做真正的主语2.动名词做真正的主语3.名词性从句做真正的主语二、类型二、类型注意区分of sb. 和for sb.三、注意要点三、注意要点it作为形式主语代替不定式代替动名词代替从句SummaryIt is+adj for/of sb+to do sthIt is+n+to do sthIt takes/took sb+sth+to do sthIt is+no use/good/useless/pleasure/a waste of sth+doing sthIt is+done+句子It is+n +句子It +v+句子Thank you !Thank you !