Unit 1 Time to Relax Grammar 动词不定式 课件 2025-2026学年人教版英语八年级下册

Unit 1 Time to Relax 八年级英语人教版 下册 Section A (Grammar) 1 They are used as adverbials of purpose. 一、新课引入 What’s the role of infinitives in these sentences? She takes a dictionary to class to look up new words. He goes to the library on weekends to borrow books. They practice spoken English every day to improve English. 二、新课讲解 动词不定式 1. 动词不定式的构成 由“to+动词原形”构成,有些情况下可省略to。是非谓语动词的一种,没有人称和数的变化,在句中不能作谓语。 二、新课讲解 动词不定式 2. 用法 (1) 作宾语,常接动词不定式作宾语的动词有want, refuse, forget, need, try, learn, choose, agree, help, hope, wish, expect, decide, begin, start等。 Lily wants to find a job as an English teacher in Beijing. 莉莉想在北京找一份英语教师的工作。 二、新课讲解 动词不定式 (2) 作宾语补足语,常接动词不定式作宾语补足语的动词有:ask, allow, tell, want, teach, wish, help, warn, invite, encourage 等。 Sam asked me to help him. 萨姆让我帮助他。 二、新课讲解 动词不定式 (3) 作目的状语,动词不定式作目的状语可以放在句首, 一般用逗号与后面的内容隔开,也可以放在句尾。 To get there on time, they started early. 为了准时赶到那儿,他们很早就出发了。 二、新课讲解 动词不定式 注意 (1) 动词不定式的否定形式是由“not+动词不定式”构成。 Jim told me not to eat junk food. 吉姆告诉我不要吃垃圾食品。 (2) 动词不定式可与疑问词what, which, how, where 等连用。 I don’t know how to do. 我不知道怎么做。 二、新课讲解 动词不定式 (3) 在某些复合宾语中,常用it代替不定式作形式宾语,而把不定式放在后面。 I find it useful to learn English well. 我发现学好英语很有用。 (4) 表示感觉的动词,如see, hear, notice, feel等,以及使役动词let, have, make 等后常用省略to的不定式。 I heard her sing a song in the next room. 我听见她在隔壁房间唱了一首歌。 三、归纳小结 一 、用所给词的适当形式填空 1. My father decided _ (spend) the summer in Yunnan. 2. I want to know how _ (improve) my spoken English. 3. It’s necessary for us _ (talk) to our parents when we have problems. 四、强化训练 to spend to improve to talk 4. Li Ming wants _ (be) a doctor when he grows up. 5. Henry’s uncle is planning _ (take) a trip to Dunhuang now. 6. Everyone should do what he can _ (protect) the environment. 四、强化训练 to be to take to protect 二 、单项选择 ( ) 1. We should build on past achievements and work together _ a better world. A. make B. making C. made D. to make ( ) 2. We will attend the tea festival in our town _ more about tea culture. A. learning B. to learn C. learned D. learn 四、强化训练 D B ( ) 3. The government is developing new plans _ ancient buildings. A. protect B. to protect C. protects D. protected ( ) 4. Our English teacher is humorous and he often tells funny jokes to make us _. A. to laugh B. laughing C. laugh D. laughed ( ) 5. Our teacher advises us _ ourselves in the sunshine. A. enjoy B. to enjoy C. enjoyed D. enjoying 四、强化训练 B C B 三、完成句子 1. I hope I can watch the film Nezha 2 again. (改为同义句) I hope _ _ the film Nezha 2 again. 2. 我的老师建议我发对所有单词的音。(补全句子) My teacher _ _ _ _ all the words correctly. 3. They went to the park so that they could see the Queen of Hearts. (改为同义句) _ _ the Queen of Hearts, they went to the park. 四、强化训练 to watch advises me to pronounce To see 五、布置作业 熟练掌握动词不定式的用法 $