沪教牛津版英语八年级下册 Unit 1 Helping those in need-2 Grammar：infinitives 教学课件.ppt

Grammar: Infinitives 八下 U1 What is “to be”? predicate 谓语 non-predicate 非谓语 What is “not to be”? 1 2 negative 否定式 to do Introduction 1 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 Usage 1: Used as object 作宾语 verb object 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 4. My mother lets me _______ (play) football after school. 5.Have you ever heard him _______ (tell) a lie? play tell Usage 2: Used as object complement 作宾补 bare/zero infinitives object object complement where how what which who when verbs question words to infinitives to go to do to read to say to stop etc. e.g. I can’t decide what to do next. Usage 1: Used as object 作宾语 Usage 2: Used as object complement 作宾补 Can you tell me when to stop? How do we use infinitives? 1. She came _________(collect) her books. 2. He bought flowers___________ (decorate) his room. 3. Jack got up early _______ (catch) the first bus. to collect to decorate to catch Usage 3: Used as adverb (of purpose) 作目的状语 4. She wore a heavy coat ______________ (keep) warm. 5. She arrived early ______________ (get) a good seat. in order to keep in order to get Why? 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. Usage 4: Used as subject 作主语 To swim It is to talk It is to learn It is to swim Summary 2 3 2 1 Used as object 作宾语 Used as object complement 作宾补 Usage 3: Used as adverb (of purpose) 作目的状语 Usages of Infinitives 4 Usage 4: Use