Unit 1 Grammar 课件 2023-2024学年沪教牛津版（广州沈阳通用）八年级英语下册

Grammar: Infinitives 不定式 八下 U1 What is “to be”? I like to dance. to sing. to read. to exercise. predicate 谓语 non-predicate 非谓语 to + V原= to-infinitive What is “not to be”? 1 2 否定形式 to do 读一读这个小故事,划出动词不定式。 The Prince(王子) planned to hold a party. Cinderella(灰姑娘) hoped to take part in the ball(舞会). Stepmother(继母) decided not to go with her. The fairy(仙女) wanted to help Cinderella. Cinderella forgot to tell her name The Prince managed to find Cinderella. How do we use infinitives? 1. _ (talk) with him is a great pleasure. 2. _ (learn) a new language is helpful. 3. _ (swim) in the sea is dangerous. To talk To learn 1. _a great pleasure _ with him. 2. _ helpful _ a new language. 3. _ dangerous _ in the sea. It is + adj. + to do sth. Usage 1: Used as subject 作主语 To swim It is to talk It is to learn It is to swim 总结:动词不定式作主语时,谓语动词用(单数 / 复数)。有时可用(it / this)作形式主语,不定式后置作(形式主语 /真正的主语 / 假主语)。 很高兴听他的演讲。 his speech is a great pleasure. = (用it作形式主语改写) To listen to It is a great pleasure to listen to his speech. How do we use infinitives? 1. Three teenagers offered _ (do) some volunteer work. 2. Cindy wanted _ (paint) a picture of the park. 3. We need _( to help) the children. to do to paint to help choose, hope, offer, want, decide, learn, plan, wish, like, hate, begin, agree, help, pretend, promise, forget, remember, etc. Usage 2: Used as object 作宾语 verb object 【练一练】 1. She wants (apologize) for being late. 2. He promised _(visit) his old friend during his stay in Shenzhen. 3. The children decide _(clean) their schoolyard this Friday afternoon. to apologize to visit to clean How do we use infinitives? 1. We taught the children_ (tell) stories. 2. Mark taught the children _ (sing). 3. My parents expect me _(go) to an ideal school. to tell to sing to go Usage 3: Used as object complement 作宾补 object object complement 常接不定式作宾补的动词 warn, tell, allow, ask, order, get, invite, wish, want, encourage…… + sb. to do sth. 【练一练】 1. Granny often tells us _(not waste) water in our daily life. 2.