Unit 1 You Can Write PoetryInfinitivesLesson 8 否定结构不定式 to do 一般结构not to do 1. 作主语2. 作宾语3. 作宾语补足语4. 作定语5. 作状语6. 作表语7. 作独立成分8. 与疑问词等连用 三 . 用法 / 功能To see is to believe.It’s important to learn .(1). 主语不定式作主语时 , 往往放在谓语之后 ,用 it 作形式主语 .My job to help the patient.Your task to clean the classroom.isis(2). 表语 I want to go home.The workers needed to get better pay.I found it necessary to talk to him again.(3) 宾语think/ consider/ find it + adj.+ to do 常用动词不定式作宾语的动词有：hope, refuse, learn, set outchoose, decide, agree, manage, pretend, plan. The teacher told me to clean the blackboard.I expect you to give me some help.(4). 宾补五看 watch see look at observe notice三使 let make have 二听 listen to hear一感觉 : feelwarn, tell, allow, help, ask, force 等 I made him do his work.He was made to do his work (by me).不定式用在介词 but, except, besides后时 , 如果这些介词前有行为动词 do 的各种形式 , 那么介词后的不定式不带 to,相反则带 to.(1). She could do nothing but cry.(2). I have no choice but to go.(3).What do you like to do besides sleep. I have something to say.He has a lot of homework to do .He is looking for a room to live in .There is nothing to worry about.(5). 定语(如果不定式中的动词是不及物动词 ,则不定式中要有介词 .) •不定式作定语时，应放在被修饰词的后面，而且放在其他后置定语之后。1. 不定式做定语与所修饰的词之间有三种关系：(1) 动宾关系 I have a lot of work to do. 我有很多工作要做。 (2) 主谓关系 He is always the first to come. 他总是第一个来。 (3) 同位关系 We all have a chance to go to college. 我们都有上大学的机会。 2. 不定式所修饰的名词或代词是不定式动作的地点工具等，即使是及物动词，不定式后面仍须有相应的介词。 3. 不定式所修饰的名词如果是 time, plac...
