Unit 2 Healthy Lifestyle Learning About Language 动词不定式做主语(1)导学案-2022-2023学年高二英语人教版（2019）选择性必修第三册

班级： 姓名： 学号： I would like to live to study, and not study to live. 主备人 李文艳 校对人 刘亚宇 高二年级二部 英语导学案 使用日期：2022年12月17日 编号：X3U2语法 X3Unit 2 Grammar——动词不定式做主语 教学目标： Master the use of to do as subject in this unit 教学难点： Master the use of to do as subject in this unit ( We will learn infinitive, and let ’ s read them now . ) 导学 自学 Look at the following sentences and discuss the function of the use of to do 1．To say is one thing and to do is another. 2．It's rude to turn your back to your teacher and refuse to answer. 3．It is impossible to learn a foreign language without making painstaking effort. 4．It seemed a pity to have wasted so much time. ( 互学 ) ( Check your answers in groups ) 展学 Show your answers actively. 教学 Say something difficult about sentence structures and the exercises. 1. 动词不定式作主语时，句子的谓语动词常用单数 To lean out of the window is dangerous.身子探出窗外很危险。 To save money now seems impossible.现在好像不可能存钱。 2. 位置： (1) 把不定式置于句首。 To get there by bike will take us half an hour. 骑自行车到那儿将花费我们半个小时。 To make up for lost time is not possible. 要弥补失去的时光是不可能的。 (2) 用it作形式主语，把真正的主语不定式置于句后，常用于下列句式中。 ① It+is+名词+to do It's our duty to take good care of the old.照顾老人是我们的责任。 ② It takes sb+some time+to do How long did it take you to finish the work? 你花了多少时间来完成这项工作? ③ It+be+形容词+for sb+to do It is difficult for us to finish writing the composition in a quarter of an hour. 我们难以在四分之一小时内完成这篇作文。 (3) 动词不定式与疑问词how, what, when, where, which连用构成不定式短语做主语 ( 检学 ) How to use the computer is a question. Ⅰ.单句语法填空 1．_______ (lean) out of the window is dangerous. 2．________(save) money now seems impossible. 3．It is an offence _______(drop) litter in the street. 4．It is stupid of you ________(write) down everything (that) the teacher says. Ⅱ.短文语法填空 I have a lot of hobbies 1.______ I studied in college. It was hard for me to save money 2.________(keep)