Unit 1 Art Discover Useful Structures 不定式作表语课件-2022-2023学年高中英语人教版（2019）选择性必修第三册

Grammar 动词不定式作表语 Unit 1 Art Lead-in 1. Perhaps the best ____ to understand Western art is to look at the development of Western painting over the centuries. 2. During the Middle Ages, the _________ of Western art was to teach people about Christianity. 3. In his work, Monet’s ___ was to convey the light and movement in the scene… 4. _______________________ was no longer show reality, but instead to ask the question, “What is art?” way purpose aim What they attempted to do Read these sentences and fill in the blanks using the correct words from the text on pages 2 and 3. 不定式:是一种非谓语动词。 1.非谓语动词:是指那些在句中不能单独充当谓语的动词， 2.动词不定式在句中可以作句子除谓语之外的任何句子成分。 3.动词不定式的被动形式除了一般形式外还有其完成式和进行式。 不定式的定义: Presentation 动词不定式是非谓语动词的一种，它没有人称和数的变化，动词不定式具有名词、形容词和副词的特征，在句中可以作主语、宾语、表语、定语、状语、宾语补足语等，但不能作谓语。动词不定式(短语)作表语主要表主动和表将来。 基本形式： to+动词原形 其否定形式是:“not/never to do”/not do 动词不定式做表语 主动语态 被动语态 一般式 to do to be done 进行式 to be doing --------- 完成式 to have done to have been done 完成进行式 to have been doing --------- Presentation 1. 结构 动词不定式可放在 be和 become, sound, taste 等__________后 面作表语，由“to do”构成。 2. 时态 动词不定式作表语时，如果不定式和逻辑主语之间是主动关系应使用__________如果是被动关系应该使用___________。 例1：His goal is _____________ (be) a volunteer at the local hospital in the coming holidays. 例2：His goal is ______________(admit) into Peking University this summer. 动词不定式 系动词 to become to be admitted to do to be done 动词不定式作表语 1. 主语通常是 suggestion, advice, proposal, aim, goal, purpose, plan, ambition, idea, intention, way, dream, duty, task, wish, hope等表示意向、打算、计划的词，一般用不定式作表语说明主语的内容。 有时根据表达的需要，在作表语的不定式前，添加疑问代词/副词，包括 what, who, how, when, where 等,构成“疑问词+to do”作表语。 例如：The problem was how to begin. Her wish is to be a teacher. The duty of soldiers is to defend their country. 1）主语是表示意向、打算、计划等的词，如aim，purpose, wish, idea, task, plan，decision，choice，duty, dream, job等词时，常用不定式作表语。 不定式作表语用法 Presentation 动词不定式(短语)作表语的用法 1．表示目的 The next step is to make sure that you know what is needed. The purpose of education is to develop a fi