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课件网) Unit 2 Natural disasters Grammar and usage To-infinitives 不定式 Grammar and usage 1.To talk to a friend openly and sincerely is very important when something unpleasant happens. 2.He refused to offer this school money and books. 3.The purpose of new technologies is to make life easier, not to make it more difficult. 4. He invited me to give a speech on Chinese history. Read the sentences below and figure out the functions of to-infinitives. subject主语 object宾语 predicative表语 object complement 宾补 conclusion: 不定式可以构成句子的基本成分，充当 主语，宾语，表语，宾语补足语 5.Vinny is the first disabled person to sail around the world. 6.To get there on time, I took a taxi instead of a bus. 7.He opened the door, only to find two strangers outside. attributive 定语 adverbial of purpose 目的状语 adverbial of result 结果状语 Review 一．不定式做主语 动词不定式作主语时，句子的谓语动词常用_____ （1）把不定式置于_____。 如： a) To get there by bike will take us half an hour. b) Never to make mistakes is impossible. (2)用it作形式主语 ①It＋be＋名词＋to do It's our duty to take good care of the old. ②It＋be＋形容词＋for sb＋to do (difficult, easy, hard, important, impossible, necessary) It is difficult for us to finish writing the composition in a quarter of an hour. 单数 句首 思考： it作形式主语的句型有哪些？ ③It＋be＋形容词＋of sb＋to do (careless, clever, good, foolish, honest, kind, lazy, nice, right silly, stupid ,wise) It is stupid of you to write down everything the teacher says. ④It takes sb + some time + to do How long did it take you to finish the work ⑤It seems(appears)＋形容词＋to do It seemed impossible to save money. 二. 不定式作宾语 ①只能跟不定式作宾语的动词有哪些？ 希望想要做决定， 假装同意和答应， 碰巧没能安排好， 决心准备再提供， 设法学会拒绝。 I decided to ask for my money back. When our visit to the farm was over, we expected to start back on foot. hope,wish/expect/want/intend,decide pretend,agree, promise happen,fail, arrange/plan determine, prepare, offer refuse, learn, manage ②it做形式宾语 S＋V＋it＋n/adj +(for sb)＋to do 常见动词_____ a) We _____ (认为学习一门外语很重要)a foreign language well. b) He feels _____(这是他的责任)to help the poor. ③介词but, except, besides + to do/do (有do无to，无do有to) The enemy soldiers had no choice but to give in. On Sunday afternoon I had nothing to do but watch TV. find, think, believe, consider，feel等 think it very significant to learn it his duty 三、不定式做表语 请找出表语部分 ①To be kind to the enemy is to be cruel to the people. ②My chief purpose is to point out the difficulties of the matter. ③What I would suggest is to put off the meeting. 四、不定式作宾语补足语 (1)常见要求不定式作宾补的动词有： allow, ask, advise, beg, cause, drive（强迫），encourage, expect, forbid, force, get, would like (love, hate), order, permit, persuade, teach, tell, want, warn, wish, ask for, care for, call on, count on, depend on, wait ... ...
