Unit 4 Discovering Useful Structures 课件 -2022-2023学年高中英语人教版（2019）必修第三册

Unit 4 Space Exploration Discovering Useful Structures Infinitives 不定式由“to + do (动词原形)”构成, 其否定形式是“not to do”, 不定式可以带宾语或状语构成不定式短语, 没有人称和数的变化, 但有时态和语态的变化。 The definition of infinitive I am glad to see you. He has decided to give her some money. 表示的动作通常与谓语所表示的动作 或状态同时或者几乎同时发生，或是 在它之后发生。 I am very glad to be working with you. He pretended to be working hard when his boss passed him. 表示的动作通常与谓语动词表示的动 作同时发生。 He happened to have seen the film before. The novel is believed to have been translated into Chinese. 不定式所表示的动作发生在谓语动作 或状态之前。 主动语态 to do 被动语态 to be done It is an honor for me to be invited to attend the meeting. Everyone likes the hero to be praised. Functions of infinitives To live abroad is not easy. She planned to visit her parents next week. To see is to believe. The first person to come is Mr. Brown. He went to France to learn French. His father encouraged him to find a new job. 主语 宾语 表语 定语 宾补 状语 Step 1 Lead-in 不定式是____________的一种, 在句中不能独立作___________。可以作___________________________________________________。 非谓语 谓语 主语、宾语、表语、宾语补足语、定语、状语 1　用所给词的适当形式填空 ①I am honoured __________ (deliver) a speech at the opening ceremony on behalf of our school． ②The question ______________ (discuss) tomorrow is about the pollution. ③The book is said to ___________________ (translate) into four languages so far． ④The little boy pretended ___________ (read) the book when his teacher entered the classroom． to deliver to be discussed have been translated to be reading Step 3 Studying the rules 动词不定式作定语， 修饰名词或代词， 动词不定式和它所修饰的词之间有逻辑上的动宾关系、主谓关系、动状关系或同位关系。动词不定式通常要放在这些被修饰词的后面。常指________ 的动作。 1.Infinitives as attributes 1. I have no desire to write. 2. The Smiths were the first to arrive. 3. There was nothing to be done. 4. I have a lot to say. 5. I have no idea where to go. 6. The conference to take place in Shanghai next week is of great importance. 尚未发生 只能用动词不定式做定语的情况 例：1. Please make an effort to catch the bus. 2. He made a promise to come here on time tomorrow. 1.当修