Unit3语法补充2021-2022学年人教版八年级下册英语

英语语法补充不定式

一、不定式有种身份名词、形容3词、副词肯定结构（+动词原形；）否定结构not to do~to do~to注意有些情况不定式省略肯定结构（不定式省略）to do~to＞否定结构（不定式省略）1做名词not do~to•To deanmv room takes me two hours.不定式做主语，看作一件事，看做单数=Ittakes metwo hoursto deanmv room.不定式做主语，可以用代替I wantto read books.it不定式做宾语不定式做表语•His dreamis tobe ateacher.I wanthim toread不定式做宾补（宾补就是补充宾语一一宾语做什么）books.

2、做形容词放名词后吃的做I havesomething to eat.toeatI havenothing to do,todo的买东西的

3、做副It is a goodplace tobuv things.to buythings词放句子前或句子后（为了，因为，结果）为了因为I wentthere toreadbook.I amhappy tomeet you.结果

二、不定式在这I wenthome tofind housetidy anddean•些情况下省略to）使役动词（不定式省略）1make/have/let to（省略）=make sbdo sth=have sbdo sthto使某人做某事、让某人做某事Eg Hemakeme washmy clothes.他让我洗衣服）感官动词（三眼、两耳、一注意、一感觉）巫:看到2See sb某人经常做什么、看到某人做了什么（省略）I sawhim plavbasketball vesterdav.to）（省略）

三、不定式3help sbdo sthto=help sbtodosth做主语，看做单数，用it代替不定式做主语，看作一件事，看做To know vourself isdifficult.单数作主语时，用代替,真正的主语=It isdifficult toknowvourself.it放后面动名词动名词动词变成名词+ing,动名词=名词Cleinian mvroomtakesmetwohours.动名词做主语，看做一件事，用作单数reading动名词做宾语is beins•I likebooks.His dreama动名词做表teacher.语“疑问词+不定式”=名词常见的疑问词who,whom,what,which,is aproblem.whose^hen,where,how~Where tolive iS~~isaproblem.里是个问题句子=名词that+句子--可以做主语、宾语、表语1Thatthat+he livesin Beijingis goodnews forme.他居住在北京，对于我而言是个好消息句子•一做主语，叫做主语从句2Ithat+、think thathe isfriendlv-句子•一做宾语,叫做宾语从句注意that+宾语从句中可以省略3The troublethat、is thatwe needmoney.句子…•做表语，叫做表语从句that+。