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 非谓语动词 动词不定式 to do 现在分词（doing) 过去分词 (done) 动名词(doing ) 2 主动语态 被动语态 用法 一般式 进行式 完成式 to do to do to be done to be doing to have done to have been done 表示动作将要发生或者于谓语动作同时发生。 表示谓语动作发生时，不定式动作正在进行。 表示动作发生在谓语动作之前。 否定式： not to do not not not not not Functions of infinitives To live abroad is not easy. She planned to visit her parents next week. The question is how to get there. 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 点击添加文本 点击添加文本 点击添加文本 点击添加文本 一.to do 不定式 作主语 翻译句子：学好英语不容易。 动词不定式作主语时，一般可用it作形式主语，而将动词不定式置于句末。 e.g. To learn English well is not easy. = It’s not easy to learn English well. 不定式的逻辑主语有时用“of/for+名词或代词宾格”构成。 结构：It’s + adj for/of sb to do sth. of/for? It’s difficult_____ me to work out the maths problem. for It’s kind ______you to help me. nice, kind, good, silly, clever, wrong, honesy…修饰人 easy; hard; difficult; interesting ; exciting boring; …修饰物或事 of It is no use crying over spilt milk. It is of little good staying up too late every day. 但在下列句型中常用-ing形式作主语。 It is/was no use/good useless no fun/pleasure a waste of time +doing sth. 点击添加文本 点击添加文本 点击添加文本 点击添加文本 二.to do 不定式 作表语 翻译句子：提高你英语的最佳方式是加入一个英语俱乐部。 动词不定式作表语用来表示主语的身份,状态和特征等。可与系动词构成系表结构. The best way to improve your English is to join an English club. 注意、不定式做表语时，如果主语里含有实义动词do的各种形式，那么不定式的to要省略。 The only thing I can do is in bed. 我现在唯一能做的就是努力学习。 Her wish is a pop singer. lie to become What I can do now is study hard. 注意 若主语和表语都是非谓语动词, 应保持形式上的一致。 Seeing is believing. To see is to believe. 眼见为实。 点击添加文本 点击添加文本 点击添加文本 点击添加文本 三.to do 不定式 作宾语 单句填空： The little boy decided _________(plant) a tree in his school. 宾语表示主语所做动作的承受者,一般跟在及物动词后面. e.g. We need to finish the task ahead of time. to plant 接动词不定式作宾语常见的几个动词： 1.需要做______ to do 2.决定做______ to do 3.想要做______