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1、Unit 9:现在完成时讲解一 基本结构：助动词have/has+过去分词(done) 二句型：否定句：主语+have/has+not+过去分词+其他.一般疑问句：Have/Has+主语+过去分词+其他.简略答语: Yes, 主语 + have/has.(肯定)No, 主语 + havent/hasnt.(否定)三用法（1）现在完成时表示过去发生或已经完成的动作对现在造成的影响或结果I have spent all of my money (so far).(含义是:现在我没有钱花了.) Guo Zijun has (just/already) come. (含义：郭子君现在在这儿)My fa
2、ther has gone to work.(含义是:我爸爸现在不在这儿) （2）现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用. for+时段since+过去一个时间点（译为：自从以来）since+时段+agosince+从句（过去时）It is+时段+since+从句（过去时）Mary has been ill for three days. I have lived here since 1998. 四has gone (to),has been (to), has be
3、en (in) 的区别 Have/Has gone(to) :去了(现在不在说话现场)Where is your father？He has gone to Shanghai. Have/Has been (to) :去过（已不在去过的地方）My father has been to Shanghai. Have/has been in：呆了多久（还在所呆的地方）My father has been in Shanghai for two months. /since two months ago.五现在完成时的标志1.现在完成时的含义之一是过去完成的动作对现在仍有影响,用以下四大标志词可以表
4、达这种含义: * 以already, just和yet为标志 He has already got her help.他已得到她的帮助。He has just seen the film.他刚刚看过这场电影。He hasnt come back yet.他还没有回来。* 以ever和never为标志This is the best film I have ever seen.这是我曾经看过的最好的一部电影。He has never been to Beijing.他从没有到过北京。* 以动作发生的次数为标志He says he has been to the USA three times.
5、他说他已经去过美国三次了。* 以so far（到目前为止）为标+before He has got to Beijing so far.到目前为止他已到了北京。She has passed the exam so far.到目前为止她已经通过了考试。2.过去已经开始的动作一直延续到现在, 甚至有可能继续延续下去,我们可以从动作“延续”的特性和“时间”点段的区分入手,进一步学习现在完成时。* for+时间段 since+过去一个时间点（过去从句）为标志注意： 1)现在完成时不能单独与过去的时间状语连用, 如yesterday,last week, three years ago 等; 2)不能与
6、when连用 2.现在完成时往往同表示不确定的过去时间状语连用六过去分词 1 、规则动词：规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。四点变化规则： (1)、一般动词，在词尾直接加“ ed ”。 work-worked-worked ,visit-visited-visited (2)、以“ e ”结尾的动词，只在词尾加“ d ”。 live-lived-lived , (3)、以“辅音字母 + y ”结尾的动词，将 y 变为 i ，再加“ ed ”。 study-studied-studied ,cry-cried-cried (4)、重读闭音节结尾，末尾只有一个辅音字母，
7、先双写该辅音字母，再加“ ed ”。 stop-stopped-stopped , drop-dropped-dropped 2 、不规则动词：AAA型原型 过去式 过去分词burst burst burst hurt hurt hurt let let letcast cast castcost cost costcut cut cuthit hit hitput put putset set setshut shut shutspread spread spreadread read read read原形发音为/ri:d/,过去式和过去分词发音为/red/AAB型 beat beat b
8、eaten ABA型become became becomerun ran runcome came come特殊情况 ABB型bring brought broughtbuy bought boughtbuild built builtburn burnt burntcatch caught caughtdig dug dugfeel felt feltfight fought foughtfind found foundhear heard heardhold held heldkeep kept keptlay laid laidlead led ledlose lost lostmak
9、e made mademeet met metsell sold soldshoot shot shotsit sat satstand stood stoodsweep swept sweptteach taught taughttell told told think thought thoughtwin won wonABC型 begin began begunblow blew blownbreak broke brokenchoose chose chosendraw drew drawndrive drove drivendrink drank drunk fly flew flo
10、wnforgive forgave forgivenforget forgot forgottenfreeze froze frozengive gave givengrow grew grownknow knew knownride rode riddenrise rose risenring rang rungshake shook shakensing sang sungsink sank sunkswim swam swumthrow threw thrownwrite wrote written七 瞬间动词（buy,die,join,come，go, leave,join ）不能直接
11、与for since 连用。要改变动词buy-have borrow -keep come/arrive/reach/get to-be in go out-be out leave -be awaybegin-be on finish-be over open-be open close -be closed die-be dead1.have代替buy My brother has had(不能用has bought) this bike for almost four years. 2、用keep或have代替borrow I have kept(不能用have borrowed) th
12、e book for quite a few days. 3、用be替代become How long has your sister been a teacher? 4、用have a cold代替catch a cold Tom has had a cold since the day before yesterday. 5、用wear代替put on b)用“be形容词”代终止性动词 1、bemarried代marry 2、beill代fall (get) ill 3、bedead代die 4、beasleep代fall (get) asleep 5、beawake代wake/wake
13、up 6、begone代lose,die,sell,leave 7、beopen代open 8、be closed代close/shut 9、bemissing(gone,lost)代lose c)用“be副词”代终止性动词 1“beon”代start,begin 2“beup”代get up 3“beback(to)”代return to,come back to,go back to 4“be here (there)”代come(arrive,reach,get) here或go (arrive,reach,get) there等等 d)用“be介词短语”代终止性动词 1.“be in/
14、at +地点”代替go to /come to 2.用be in the army 代替join the army 3.“be in/at +地点”代替move to 常用瞬间动词变延续性动词表：1. have arrived at/in sw. got to/reached sw. come/gone/moved to sw. have been in sw./at相应的介词2. have come/gone back/returned have been back 3. have come/gone out have been out4. have become have been5. have closed / opened have been close/open6. have got up have been up；
