一般过去时1．一般过去时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。
一般过去时也表示过去经常或反复发生的动作。
2．Be动词在一般过去时中的变化：⑴am 和is在一般过去时中变为was。
（was not=wasn’t）⑵are在一般过去时中变为were。
（were not=weren’t）⑶带有was或were的句子，其否定、疑问的变化和is, am, are一样，即否定句在was或were 后加not，一般疑问句把was或were调到句首。
3．句中没有be动词的一般过去时的句子否定句：didn’t +动词原形，如：Jim didn’t go home yesterday.一般疑问句：在句首加did，句子中的动词过去式变回原形。
如：Did Jim go home yesterday? 特殊疑问句：⑴疑问词+did+主语+动词原形？如：What did Jim do yesterday?⑵疑问词当主语时：疑问词+动词过去式？如：Who went to home yesterday?动词过去式变化规则：1．一般在动词末尾加-ed，如：pull-pulled, cook-cooked2．结尾是e加d，如：taste-tasted3．末尾只有一个元音字母和一个辅音字母的重读闭音节，应双写末尾的辅音字母，再加-ed，如：stop-stopped4．以“辅音字母+y”结尾的，变y为i，再加-ed，如：study-studied5．不规则动词过去式：am,is-was, are-were, do-did, see-saw, say-said, give-gave, get-got, go-went, come-came, have-had, eat-ate, take-took, run-ran, sing-sang, put-put, make-made, read-read, write-wrote, draw-drew, drink-drank, fly-flew, ride-rode, speak-spoke, sweep-swept, swim-swam, sit-sat现在完成时：基本结构：主语+have/has+过去分词(done)①肯定句：主语+have/has+过去分词+其他②否定句：主语+have/has+not+过去分词+其他③一般疑问句：Have/Has+主语+过去分词+其他④特殊疑问句：特殊疑问词+一般疑问句（have/has+主语+过去分词+其他）（1）现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在.I have spent all of my money.(含义是:现在我没有钱花了.)Jane has laid the table.(含义是:现在桌子已经摆好了.)Michael has been ill.(含义是:现在仍然很虚弱)He has returned from abroad. (含义是:现在已在此地)（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. Mary has been ill for three days.I have lived here since 1998.注：瞬间动词（buy,die,join,lose……）不能直接与for since 连用。
要改变动词come-be go out-be out finish-be over open-be open die-be dead ……a）1.have代替buyMy brother has had(不能用has bought) this bike for almost four years.2、用keep或have代替borrowI have kept(不能用have borrowed) the book for quite a few days.3、用be替代becomeHow long has your sister been a teacher?4、用have a cold代替catch a coldTom has had a cold since the day before yesterday.5、用wear代替put onb)用“be＋形容词”代终止性动词1、be＋married代marry2、be＋ill代fall (get) ill3、be＋dead代die4、be＋asleep代fall (get) asleep5、be＋awake代wake/wake up6、be＋gone代lose,die,sell,leave7、be＋open代open 8、be closed代close/shut9、be＋missing(gone,lost)代losec)用“be＋副词”代终止性动词1“be＋on”代start,begin2“be＋up”代get up3“be＋back(to)”代return to,come back to,go back to4“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/at +地点”代替go to /come to2.用be in the army 代替join the army3.“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 back3. have come/gone out →have been out4. have become →have been5. have closed / opened→have been close/open6. have got up →have been up；7. have died →have been dead；8. have left sw. →have been away from sw.9. have fallen asleep/got to sleep →have been asleep；10. have finished/ended/completed →have been over；11. havemarried →have been married；12. have started/begun to do sth. →have done sth. ；13. have begun →have been on14. have borrowed/bought →have kept/had15. have lost →haven’t had16. have put on →have worn17. have caught /get a cold →have had a cold；18. have got to know →have known19. have/has gone to →have been in20. have joined/have taken part in the league/the Party/the army→have been a member of/ have been in/have been the Party’s member/the league member/the soldier…注意：1.现在完成时不能单独与准确时间连用，(如表示过去的时间状语）如yesterday(morning、afternoon),last(morning、afternoon)等，除非与for,since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,如already（肯定）, yet（否定，疑问）, just, before, recently,still, lately等:He has already obtained a scholarship.I haven't seen much of him recently (lately).We have seen that film before.Have they found the missing child yet ?3. 现在完成时常常与表示频度的时间状语连用,如often, sometimes, ever, never, twice, on several occasion等:Have you ever been to BeijingI have never heard Bunny say anything against her.I have used this pen only three times. It is still good.George has met that gentleman on several occasions.4. 现在完成时还往往可以同包括现在时间在内的时间状语连用,如now, up to these few days/weeks/months/years, this morning/week/month/year, just, today, up to present, so far等:Peter has written six papers so far.Man has now learned to release energy from the nucleus of the atom.There has been too much rain in San Francisco this year.The friendly relations and cooperation between our two countries have been enhanced in the past few years.Up to the present everything has been successful.5. 现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.We have had four texts this semester.6.现在完成时的"完成用法"现在完成时的"完成用法"指的是动作发生在过去某一时刻并已结束，但该动作对现在产生了影响，与现在情况具有因果关系。