Unit1 Art Learning About Language讲解 2023-2024学年高中英语人教版（2019）选择性必修第三册

Unit1 语法 不定式（to do）做表语的用法 1、 形式 1. to do 将来时主动式 2. to be done 将来时被动式 3. to be doing 进行时主动式 4. to be being done 进行时被动式 5. to have done 完成时主动式 6. to have been done 完成时被动式 2、 不定式做表语 主语+系动词+表语（to do)（表状态） 1. 主语常常是表示意向、打算、目的、希望或其具体内容等词汇，如：aim,goal,purpose,ambition,intention(意图),task(任务),plan,dream,decision,duty(责任),hope,wish,idea,way,job等。 2. 用于be动词以及系动词之后。 系动词包括： 五感：look,sound,feel,taste,smell; 五变：become,get,turn,go,grow; 三保持：keep,stay,remain; 一是：be(am,is,are); 一像：seem; 永不忘！！！ 3. 表示想法、约定、义务、命令、可能性等。 eg:We are to travel in two days. 4. what引导的主语从句（to do表目的）。 eg:What he wanted to do before going to school was to finish his homework. 5. 疑问词（what,how,why,where等）+to do. eg:The question is how to carry out the plan. 三、动词不定式做表语的时态 动词不定式做表语时，如果不定式与逻辑主语之间是主动关系应使用to do;如果是被动关系应使用to be done. Eg:His goal is to become a volunteer at the local hospital in the coming holidays. His goal is to be admitted into Peking University this summer. 四、动词不定式作表语的其他注意事项 1.一般说来,不定式前面的 to 不能省略,但当主语部分含有实义动词 do 时, to 常常省略。如: Eg:What he wants to do is go swimming in that river. 他想做的事就是去那条河里游泳。 2.当不定式的逻辑主语是句子的主语时,表示主语的责任、义务或将来的行为; 当不定式的逻辑主语不是句子的主语时,不定式是表语,表示主语的内容或性质。如: Eg: We are to keep order in the street. 我们将去街上维持秩序。(将来时) Our job is to keep order in the street. 我们的工作是维持街上的秩序。(系表结构) 五、不定式做表语相关练习 1. Dr Zhong Nanshan thinks that the doctors’ duty is _to treat (treat) patients and save their lives. 2. What we're trying to do is _to save (save) Earth. 3. He thought that the hardest thing was to control (control) the spread of the disease from person to person. 4. She loved hunting, but all that she wanted to know was how _to operate (operate) her wheelchair in the wild. 5. Our task today is to do (do)some voluntary work in the nursing home. 6. What they wanted was _to be left (leave) alone and think about what to do next. 7. The best way to improve your English is to work (work) hard at it. 8. The biggest aim of education in schools is to inspire (inspire) students to be (be) creative. 9. I