Unit 1 Life Choices Lesson 1 Lifestyles Grammar 课件 2023-2024学年高一英语北师大版（2019）必修第一册

Unit 1 Lesson 1 Lifestyles Grammar 新 课 导 入 What do you remember about them? 1. According to Joe, what is important? 2. What does he need to do? It is important to meet friends in person from time to time, not just on social media. He needs to drag himself away from the online world sometimes. 课 堂 学 习 Study these sentences. It is important to meet friends in person from time to time, not just on social media. I need to drag myself away from the online world sometimes. infinitive 不定式 subject 主语 object 宾语 9 Read each sentence and underline the infinitive. Does it function as a subject (主语), object (宾语), predicative (表语), attribute (定语), adverbial (状语) or object complement (宾语补足语)? 1. My mum keeps telling me to go out with my school friends instead. 2. It’s important to meet friends in person from time to time. 3. When I set out to do something, I do my best to achieve it. 4. My target is to prepare myself for my degree in biology at university. 5. Li Ying is the first person to join the volunteering club in her class. object complement 补语 predicative 表语 attributive 定语 adverbial 状语 subject 主语 object 宾语 动词不定式 不定式的构成 1.定义 动词不定式是非谓语动词的一种，由不定式to+do构成。没有人称和数的变化，在句子中不能作谓语，但可做主语、表语、宾语、状语和宾语补足语，具有名词、形容词和副词的特征。 动词不定式仍保留动词的一些特点。 Grammar 2.形式 时态 主动 被动 一般式 to do to be done 完成式 to have done to have been done 进行式 to be doing 完成进行式 to have been doing 否定式：否定词（not/never）+动词不定式 不定式的作用 1.作主语 不定式作主语时，谓语用单数。往往用it作形式主语，把不定式放在谓语后面。 Eg: It took us two hours to finish the job. 2. 作宾语 ① 动词+不定式 Eg: He managed to escape from the fire. ② 动词+疑问词+to，“特殊疑问句+不定式”相当于名词，作宾语。 Eg: I don't know what to do next/how to do it next. [名师点津] 不定式短语作宾语时，如果还带有宾语补足语，往往把不定式短语放在宾语补足语之后，用it作形式宾语。 Eg: I find it necessary to learn a foreign language. 3. 作宾语补足语 ① 动词+宾语+不定式（to do） Eg: He warned me to be careful. [名师点津] 可以用动词不定式作宾补的动词有：ask, tell, order, want, get, would like, like, advise, invite, allow, help, wish, warn, expect, would prefer, encourage. ② 表见解、看法的动词结构可为：动词+宾语+to be的不定式结构