Unit1LivingwellPeriod3　GrammarWriting课件（人教新课标选修7，课标通用）.ppt

Unit 1 Living well Period 3　Grammar Writing 课件（人教新课标选修7，课标通用）;结构 基本结构：to＋动词原形，有时不定式符号to可以省略。 否定形式：not to＋动词原形。 不定式一般有时式和语态的变化，通常有下表中的几种形式(以do为例)：;His works are said to have been translated into many languages.据说他的作品被译成了多种文字。 He pretended to be reading when his mother came in. 当他母亲进来时，他假装在看书。 His sister told him not to read in the sun. 他的姐姐让他不要在阳光下看书。 Mother made him get up early yesterday. 昨天母亲让他起得很早。;用法 1．作主语 To love and to be loved is the greatest happiness one can seek.爱与被爱是一个人所能寻找的最大幸福。 To ask him for help is necessary. 请求他帮助是很有必要的。 How to use the computer is a question. 如何使用电脑还是个问题。 为了避免头重脚轻，常用it作形式主语放???句首，作主语的不定式常用在句末。 It would be better for you to go there. 你还是去的好。;【温馨提示】 (1)不定式可以有自己的逻辑主语，即for sb to do, 这一短语常被称之为不定式的复合结构。 (2)在“It is ＋形容词＋不定式复合结构”句型中，当其中的形容词与不定式的逻辑主语关系密切并且用来说明逻辑主语的性质、品质、特点时，要由of引出逻辑主语，不能用for。这类形容词主要有bold，brave，careful, careless, clever, considerate, cruel, foolish, good, honest, kind，nice, right, rude, stupid, silly, thoughtful, wise, wrong等。;Its easy for Bill to work out this math problem. 对比尔来说解出这道数学题很容易。 It seemed selfish of him not to give them anything. 他不给他们任何东西，这显得太自私了。 (3)在下列结构中一般用不定式做主语：It is important/essential/necessary to do sth。而在下列结构中常用动名词作主语： It is no good/no use/ no help doing sth。 It is important for us students to learn English well. It is necessary to tell him about that. It is no good doing evil even toward evil people.;作表语 To see is to believe.眼见为实。 What impressed him most was to see the great changes that had happened there. 给他印象最深的是看到那里所发生的巨大变化。 不定式作表语时也常用来表示预定要发生的动作，或表示未来的可能性或假设。 His wish is to live in Beijing.他的愿望是将来住在北京。 All you have to do is (to) finish the job quickly. 你要干的事就是尽快把这项工作干完。;【温馨提示】;作宾语 (1)直接作动词的宾语。 以下动词后，只能跟不定式作宾语：afford (付得起)，agree(同意)，aim(力求做到)，appear(显得)，arrange(安排)，ask(要求)，attempt (试图)，care(想要)，choose(决定)，claim(声称)，condescend(屈尊)，consent(准许)，decide(决定)，demand(要求)，determine(决心)，endeavor(竭力)，expect(期待)，fail(未履行)，help(帮助)，hesitate(犹豫)，hope(希望)，learn(学会)，manage(设法)，neglect(疏忽)，offer(主动提出)，plan(计划)，