Unit 2 Healthy Lifestyle Grammar 语法讲解课件 2022-2023学年高中英语人教版（2019）选择性必修第三册

Discover useful structures Grammar NOTE: To replace a picture, just select and delete it. Then use the Insert Picture icon to replace it with one of your own! 1 To change bad habits is never easy. It took extra time to do the job properly. To join the People’s Liberation Army, it is required for men to shave off their beards. It was not polite to disturb your neighbors with loud music last night. Activity 1 1 动词不定式作主语 （ 1）用作主语的不定式及短语常出现在谓语动词之后，而句首用形式主语it 代替。 It is not right for people with the virus to go to public places. （ 2）单个不定式作主语，谓语动词用单数形式。 To get enough protein each day is beneficial to our health. To get good grades requires a lot of hard work. 动词不定式 （3）常用句型： ① It is + adj. + for /of sb. + to do sth. 形容词表示事物或行为的特点或性质，介词用for，如 difficult, possible，necessary. 形容词表示人的品格或特点，介词用of，如 kind，polite，impolite， rude，foolish. It is necessary for us to prevent the war breaking out. It is too impolite of you to speak to an outstanding teacher like this. ② It +be+ 名词+to do sth. 做某事是…… It’s my duty to take good care of my younger sister. ③ It takes sb. some time to do sth. 做某事花费某人多长时间 It took me more than an hour to do my homework yesterday evening. 单句语法填空 （1）Sometimes it’s better 　　　　 　（remain） silent. （2）Although 　　　　 　 is a hard task to protect our environment，we can’t help but go ahead. （3） 　　　 　 　（control） the air pollution is necessary. （4）It was foolish 　　　　 　 him to endanger his life in that way. （5）Don’t you think it is rude 　　　　 　 him to ask a lady her age? （6）It is difficult 　　　　 　 him to live on such a small salary. to remain it To control/Controlling of of for 2 疑问词 + 不定式 （1）可用于该结构的疑问词 疑问代词：who，whom，what，which 疑问副词：when，where，how （2）常接该结构的动词：know，see，decide，tell，ask，consider，explain，learn，wonder （3）该结构的句法功能：主语、宾语和表语 How to construct the theoretical framework is very important. I know where to find that patriotic young man. The question is when to start developing such a vaccine. 单句语