一般过去时与现在完成时

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-cooked

2．结尾是e加d，如：taste-tasted

3．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-stopped

4．以“辅音字母+y”结尾的，变y为i，再加-ed，如：study-studied

5．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) the 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、be＋married代marry

2、be＋ill代fall (get) ill

3、be＋dead代die

4、be＋asleep代fall (get) asleep

5、be＋awake代wake/wake up

6、be＋gone代lose,die,sell,leave

7、be＋open代open 8、be closed代close/shut

9、be＋missing(gone,lost)代lose

c)用“be＋副词”代终止性动词

1“be＋on”代start,begin

2“be＋up”代get up

3“be＋back(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/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 out

4. have become →have been

5. have closed / opened→have been close/open

6. 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 on

14. have borrowed/bought →have kept/had

15. have lost →haven’t had

16. have put on →have worn

17. have caught /get a cold →have had a cold；

18. have got to know →have known