Unit 9When was it invented grammar.ppt

Brief introduction 1.定义：一般过去时态表示过去某个时间发生的动作或存在的状态，常和表示过去的时间状语连用；也表示过去经常或反复发生的动作，常和表示频度的时间状语连用。2.时间状语：与一般过去时相对应的时间状语是表示过去的时间的单词或短语。E.g.yesterdaylast nightin 1990three days ago 等3.频度副词：与一般过去时相对应的频度副词与一般现在时的频度副词非常相似。E.g.often,sometimes,always 等.4.例句：the car was invented in 1885.I got up at 7:00 yesterday.My father was at work yesterday afternoon.He always went to work by bus last year.5.一般过去式的句子构成。肯定句:S+动词过去式+O+其他成分 如:Julie Thompson invented battery-operated sneakers.否定句:S+didnt/did not+动词原形+O+其他成分 如:Shen Nong didnt invent tea on purpose.一般疑问句:did+S+动词原形+O+其他成分 如:Did the chef invent potato chips by mistakes?特殊疑问句：疑问词+did+S+动词原形+O+其他成分 如：When did you graduate from this school?一般过去时的被动语态 一般过去时的被动与台只须在一般现在时的被动语态的基础上将动词变为动词的过去式即可。1.肯定句：S+was/were+动词过去分词+其他成分2.否定句：S+wasnt/werent+动词过去分词+其他成分3.一般疑问句：was/were+S+动词过去分词+其他成分4.特殊疑问句：疑问词+was/were+S+动词过去分词+其他成分规则动词过去式的构成规则动词过去式的构成构成规则例词1、一般在动词原形末尾加、一般在动词原形末尾加 ed look looked play played start started2、结尾是结尾是 e 的动词加的动词加-d live lived hope hoped use used3、末尾只有一个辅音字母的末尾只有一个辅音字母的 重读闭音节词，先双写这重读闭音节词，先双写这 个辅音字母，再加个辅音字母，再加ed stop stoppedplan plannedtrip tripped4、结尾是结尾是“辅音字母辅音字母+y”的动词，的动词，先变先变“y”为为“i”再加再加ed study studiedcarry carried规则动词词规则动词词-ed的读音的读音说明：说明：1、清念、清念/t/，即即 ed 在清辅音后面念在清辅音后面念/t/,例：例：finished helped passed cooked2、元浊元浊/d/,即即 ed 在元音，浊辅音后面念在元音，浊辅音后面念/d/,例：例：borrowed enjoyed called moved 3、/t/d/之后念之后念/id/,即即 ed 在在/t/d/音后面念音后面念/id/例：例：wanted shouted needed counted不规则动词表不规则动词表Infinitive Past tenseam/is wasare werebegin begunbreak brokebring broughtbuild builtbuy boughtcan couldInfinitive Past tensecatch caughtcome camedo diddraw drewdrink drankdrive droveeat atefall fell动词过去式转换练习动词过去式转换练习将下列动词变为过去式将下列动词变为过去式e16.say17.see18.put19.eat20.take21.readlookedcarriedcalledweredidsaidatelivedhopedfinishedwentgotsawtookstoppedtrippedwantedhadcameputread一般过去时态练习一般过去时态练习用动词的过去式填空用动词的过去式填空1._ you _(remember)to buy the oranges?2.Who _(invent)the computer.3.We _(go)to the cinema last night.The film_(be)very good.4.What time _you _(get)to school this morning?5.Jim _(do)a lot yesterday.He_(go)shopping and_(cook)supper.Did rememberinventedwentwasdidgetdidwentcookedPRACTISE改写句子：改写句子：1.Lucy did her homework at home.（改否定句）改否定句）Lucy _ _ her homework at home.2.He found some meat in the fridge.（变一般疑问句变一般疑问句)_ he _ _ meat in the fridge?3.She stayed there for a week.（对划线部分提问）对划线部分提问）_ _ _ she _ there?4.There was some orange in the cup.（变一般疑问句变一般疑问句)_ there _ orange in the cup?didnt do Did find any How long did stay Was any选择填空。1.I _ at that school ten years ago.A.study B.had studied C.have studied D.studied2.The baby _ at his mother as soon as he saw her.A.smiles B.smile C.smiled D.had smiled3.What did you do last Sunday?I _ the piano at home.A.am playing B.have played C.played D.plaidDCC4.The young man got up very early that morning and _ not to be late again.A.try B.tries C.tried D.tired5.The car _ and an old man with glasses came out.A.stops B.stopped C.stoped D.was stopping6.The visitor _that they would go to the Great Wall the next morning.A.hear B.hears C.heard D.heared7.The policemen _ the thief while he was sleeping.A.cought B.caught C.catched D.catchCBCB8.The old man _ off until the bus started.A.did not get B.has not got C.will not get D.not got9.Jenny _ good at sports when she _ a schoolgirl.A.wasntwas B.didntwas C.werentis D.isntwas10.It rained so hard yesterday that we _ a good time in the park.A.had not B.have not C.didnt have D.dont haveAACCorrect the following sentences.1.From the magazine I learned there was no air or water on the moon.2.Did you see my pen?I looked for it for about an hour but didnt find it.ishave been looking for