一般过去时与一般现在时定义及结构的区分[全文5篇]

第一篇：一般过去时与一般现在时定义及结构的区分

一、一般过去时与一般现在时定义及结构的区分

1）概念一般过去时：过去发生的动作或是状态a.表示过去某个时间里发生的动作或状态； b.过去习惯性、经常性的动作、行为； c.过去主语所具备的能力和性格。

一般现在时：现在通常性、规律性、习惯性的动作或是状态a.表示经常发生的动作，是一般情况不是具体的某一件事； b.长期存在的一种状态； c.永恒的事实或真理，谚语等。

2)基本构成A．主谓（谓语动词是实意动词）（宾）：

一般过去时：肯定句：主语+动词过去式+其他；否定句：主语+did+not+动词+其他；疑问句：Did+主语+动词+其他；特殊疑问句：特殊疑问词+did+主语+动词+其他；否定疑问句：Did+主语+not+动词+其他

一般现在时：肯定句：主语+动词或（动词+s）+其他；否定句：主语+do/does+not+动词+其他 疑问句：Do/Does+主语+动词+其他特殊疑问句：特殊疑问词+do/does+主语+动词+其他 否定疑问句：Do/Does+主语+not+动词+其他注：变化最大的在于:do/does→did(过去式的动词变化)

B.谓语动词是助动词时：

a． Be 动词 一般过去时：肯定句：主语+was(were)+表语 否定句：主语+was(were)+not+表语 疑问句：Was(Were)+主语+表语特殊疑问句：特殊疑问词+was(were)+主语+表语 否定疑问句：Was(Were)+主语+not+表语 一般现在时：肯定句：主语+be动词+表语 否定句：主语+be动词 +not+表语疑问句：Be动词 +主语+表语特殊疑问句：特殊疑问词+be动词+主语+表语 否定疑问句：Be动词 +主语+not+表语 注意：am(I)、is（he/she/it）→wasAre(we/you/they)→were第三人称时，动词要进行变化。

b.have/has一般过去时：肯定句：主语+had+表语否定句：主语+had+not+表语疑问句：Had +主语+表语Did+主语+have+表语 特殊疑问句：特殊疑问词+did+主语+have/has+表语 否定疑问句：Did +主语+have/has+not+表语 一般现在时：肯定句：主语+have/has+表语否定句：主语+have/has +not+表语 疑问句：Do/Does+主语+have/has+表语 特殊疑问句：特殊疑问词+have/has +主语+表语 否定疑问句：Do/Does +主语+not+表语注意：不管是过去时还是现在时，疑问句都需要助动词did或do.c.情态动词过去式：一般过去时：将情态动词变成过去式，后面加原形，其他句型转变的规 则与be动词基本一致。Shall will can may must have to 例：I can swim.3)怎样从时间状语上判断一般现在时和一般过去时一般过去时yesterday(morning,afternoon,evening)the day before yesterday last night(week Sunday weekend month winter year,century 世纪）；ago ；this morning/afternoon/evening ；when引导的状语从句（过去时）；just now ；the other day--a few days ago；at the age of 10（过去年龄段）；in the old days

一般现在时always usually regularly every morning /night/evening/day/week often sometimes occasionally from time to time, twice a week, rarely, seldom, once a month, hardly, ever, never

4)一般过去时与一般现在时动词的变化规则： 一般过去时：A.规则动词过去式的构成有四条规则：①一般在动词原形末尾直接加上-ed。如：look-looked。②以不发音的字母e结尾的动词，去e再加-ed。如：live-lived。③末尾只有一个辅音字母的重读闭音节，先双写这个辅音字母，再加-ed。如：stop-stopped。④末尾是辅音字母+y结尾的动词，先变y为i，然后再加-ed。如：study-studied。B.不规则动词的过去式需特殊记忆。如：am(is)-was, are-were, go-went,come-came, take-took, have(has)-had等。注: 课本后面都有不规则动词的变化，需熟记。一般现在时：a.一般情况下，加-s;b.以s, sh, ch, x，o等结尾的词, 加 –es;c.以辅音字母+y结尾的词, 变y 为i再加es

第二篇：一般过去时与一般现在时的区分

一、一般过去时与一般现在时定义及结构的区分

1）概念

一般过去时：过去发生的动作或是状态

a.表示过去某个时间里发生的动作或状态；

b.过去习惯性、经常性的动作、行为；

c.过去主语所具备的能力和性格。

一般现在时：现在通常性、规律性、习惯性的动作或是状态 a.表示经常发生的动作，是一般情况不是具体的某一件事； b.长期存在的一种状态；

c.永恒的事实或真理，谚语等。

2)基本构成 并不能

A．谓语动词是实义动词时的结构：

一般过去时：

肯定句：主语+动词过去式+其他

否定句：主语+did+not+动词+其他

疑问句：Did+主语+动词+其他

特殊疑问句：特殊疑问词+did+主语+动词+其他 否定疑问句：Did+主语+not+动词+其他

一般现在时：

肯定句：主语+动词或（动词+s）+其他

否定句：主语+do/does+not+动词+其他

疑问句：Do/Does+主语+动词+其他

特殊疑问句：特殊疑问词+do/does+主语+动词+其他 否定疑问句：Do/Does+主语+not+动词+其他

注：变化最大的在于:do/does→did(过去式的动词变化)

B.谓语动词是助动词时：

a． Be 动词

一般过去时：

肯定句：主语+was(were)+表语

否定句：主语+was(were)+not+表语

疑问句：Was(Were)+主语+表语

特殊疑问句：特殊疑问词+was(were)+主语+表语 否定疑问句：Was(Were)+主语+not+表语

一般现在时：

肯定句：主语+be动词+表语

否定句：主语+be动词 +not+表语

疑问句：Be动词 +主语+表语

特殊疑问句：特殊疑问词+be动词+主语+表语

否定疑问句：Be动词 +主语+not+表语

注意：am(I)、is（he/she/it）→was

Are(we/you/they)→were

第三人称时，动词要进行变化。

b.have/has

一般过去时：

肯定句：主语+had+表语

否定句：主语+had+not+表语

疑问句：Had +主语+表语Did+主语+have+表语

特殊疑问句：特殊疑问词+did+主语+have/has+表语

否定疑问句：Did +主语+have/has+not+表语

一般现在时：

肯定句：主语+have/has+表语

否定句：主语+have/has +not+表语

疑问句：Do/Does+主语+have/has+表语

特殊疑问句：特殊疑问词+have/has +主语+表语

否定疑问句：Do/Does +主语+not+表语

注意：不管是过去时还是现在时，疑问句都需要助动词did或do.c.情态动词过去式：

一般过去时：将情态动词变成过去式，后面加原形，其他句型转变的规

则与be动词基本一致。

shall―will―can—may―must―

have to―

例：I can swim.肯定句:

否定句：

疑问句：

3)怎样从时间状语上判断一般现在时和一般过去时

一般过去时：

yesterday(morning,afternoon,evening)；the day before yesterday ；

last night(week,Sunday,weekend,month,winter,year,century 世纪）； ago ；this morning/afternoon/evening ；when引导的状语从句（过去时）；

just now ；the other day--a few days ago；

at the age of 10（过去年龄段）；in the old days

一般现在时：

always,usually,regularly,every

morning/night/evening/day/week,often,sometimes,occasionally,from time to time, twice a week, rarely, seldom, once a month, hardly, ever, never

4)一般过去时与一般现在时动词的变化规则：

一般过去时：

A.规则动词过去式的构成有四条规则：

①一般在动词原形末尾直接加上-ed。如：look-looked。

②以不发音的字母e结尾的动词，去e再加-ed。如：live-lived。

③末尾只有一个辅音字母的重读闭音节，先双写这个辅音字母，再加-ed。

如：stop-stopped。

④末尾是辅音字母+y结尾的动词，先变y为i，然后再加-ed。

如：study-studied。

B.不规则动词的过去式需特殊记忆。如：am(is)-was, are-were, go-went,come-came, take-took, have(has)-had等。

注: 课本后面都有不规则动词的变化，需熟记。

一般现在时：

a.一般情况下，加-s;

b.以s, sh, ch, x，o等结尾的词, 加 –es;

c.以辅音字母+y结尾的词, 变y 为i再加es.一、课堂练习

一）、写出下列动词的三单形式和过去式

三单过去式三单过去式三单过去式三单过去式

buy _______ _______fly _____ _______plant ______ _______study ______ _______

drink _____ ______play_____ _______go ______ _______make ______ _______

do _______ ______dance ______ ______worry ______ _______ask _______ _______

taste _____ ______put ________ ________

let ______ ______run _______ _______keep _____ _______have______ ________

find _____ ______get____ring _______ ________

write_____ _______ sleep _______ _______give _____ _______stop______ _______

二）.用正确的动词形式填空

1.The children ___________(run)everyday.2.-I ________ up at half past six this morning.(get)

-My father always __________(come)back from work very late.3.My mother ____________ a lot of fruit yesterday afternoon.(buy)

4.They ________ _________ a meeting yesterday.(not have)

5.-______ you _________(have)any color pens?-Sorry, I don’t have any.6.She likes eggs, but she __________________(not like)bread.7.My mother(tell)me a story every night.8.– How much meat ________ you ___________(want)?-A kilo,please.9.Someone __________(be)in the next room.10.There __________(be)a pen and two erasers in the pencil-box.11.You must _________(get)here at two this afternoon.12.The twins _________ thirteen two years ago.(be)

13.We must __________(help)the teacher carry it.14.Who __________(teach)you English in your school?

15.The teacher is busy.He only __________(sleep)five hours a day.16.Near our school there _________(be)a shop, it _________(sell)a lot of

books.17..18.What _______ he _________(like)?

19.He __________(teach)English in a middle school.20.Y21.He can ___________(sing)this song.22.Let’s ___________(help)my mother ___________(cook).23.I think Li Lei must ______________(be)at school.24.There __________(be)some bread and meat on the table.25.Liu Ying _______________(study)in Beijing these days.26.Han Meimei often ____________(play)games after school.27.Lily __________(be)a Young Pioneer.三）.句型转换

1.They came to China in 1990.(变一般疑问句)

__________ they ________ to China in 1990?

2.I was ill for two days last week?(同上)

________ you ill for two days last week?

3.The twins go to school on foot every day.(同上)

_________ the twins _______ to school on foot every day?

4.She washed the clothes last Sunday.(变否定句)

She _________ ________ the clothes last Sunday.5.My mother likes her students.(变一般疑问句)

_______________________________________

6.Do you watch TV on Sunday?(用last Sunday 改写成过去时态的句子)______________________________________________

7.Wei Hua bought a new pen yesterday.(变否定句)

She ________ ________ a new pen yesterday.8.We had a meeting the day before yesterday.(变一般疑问句)

_______ you _______ a meeting the day before yesterday?________ ________ the twins _______ a good time?

10.There were some cars in front of the house just now.否定句：There _______ ________ cars in front of the house just now.一般疑问句：______ there _____ cars in front of the house just now? 否定句：He ________ _______ to the zoo with his father yesterday.一般疑问句：______ he ______ to the zoo with his father yesterday? 特殊疑问句：heyesterday?否定句：Mary usually _______ ________ games with her grandparents.一般疑问句：______ Mary usually ________ games with her grandparents? 特殊疑问句：Mary usually?

13.Mary does her homework well.否定句：Maryher homework well.一般疑问句：Maryher homework well?

二、作业布置

一）填空They____(be)on the farm a moment ago.There____(be)a shop not long ago.Jenny____(not go)to bed until 11:00 o'clock last night.Danny _____(read)English five minutes ago.I _____(see)Li Lei ____(go)out just now.He ____(do)his homework every day.But he __(not do)it yesterday.7 When I was young, I _____(play)games with my friends.When ____you_____(write)this book? I _____it last year.Did he____(have)lunch at home?

11.There __________(be)some bread and meat on the table.13.Liu Ying _______________(study)in Beijing these days.14.They _____________________(clean)the floor now.15.Han Meimei often ____________(play)games after school.二）改错

1.Does he enjoys listening to music?

2.Mary’s mother was ill yesterday.She has to stay at home to look after her.3.My teacher was angry because I am late.4.The boy has a party at home now.5.I were went to the library with my friends two hours ago.6.He spends much time reading book last weekend.7.Linda can helps his mother clean the room.8.I buyed a large bag of milk in the supermarket.9.Someone are looking at you.10.I am go fishing now.

第三篇：一般过去时和一般现在时对比

一般过去时

含义:表示过去发生的动作或状态。

句子结构： 主语+动词过去式+其他

提示词：yesterday,last Sunday,in 2001, when I was 9....动词过去式的规则变化：

1.直接在词尾加 ed

2.以e结尾之直接加d

3.以辅元辅结尾，双写最后一个辅音字母加ed

4.以辅音加y结尾，把y改成ied

常见动词的不规则变化

am/is---was是draw—drew画画fly---flew飞are----were 是make---made制作sing---sang唱歌have---had 有catch---caught抓住say---said 说话get---got得到do---did做sit---sat 坐go---went去sleep---slept睡觉give---gave给speak---spoke说take---took拿ride---rode骑eat---ate 吃buy---bought买read---read读see---saw看见come---came来drink---drank喝swim---swam游泳write---wrote写meet—met 遇见send—sent发送cut—cut切断find—found 发现tell—told 告诉wear-wore穿着

一般现在时

含义：表示现在经常发生的动作或者状态，以及客观事实和永恒真理。

句子结构:主语+动词+其他

提示词：often,usually,always,sometimes,on Sundays,every day...注意点：当主语是第三人称单数时，动词要用单三形式。

动词单三的变化规则：

1)直接在词尾加sswim-swims

2)当词尾是s,x,sh,ch,o时，加esgo-goes

3)当词尾是辅音字母加y时，把y改为iescarry-carries

4)特殊变化：have-hasbe-is

第四篇：一般现在时和一般过去时被动语态练习

一般现在时和一般过去时练习

一、将下列句子改为被动结构：

1.My cousin bought a color TV set.______________________________________________________________ 2.My brother mended his watch last night.________________________________________________________ 3.Mother made a big cake for us yesterday.________________________________________________________ 4.They painted the table green last week.__________________________________________________________ 5.They found some money lying on the floor.______________________________________________________ 6.She showed me her new skirt._________________________________________________________________ 7.His mother made him do his homework carefully._________________________________________________ 8.My uncle used up all of his money._____________________________________________________________ 9.He told me to wait for him at the school gate._____________________________________________________ 10.John didn’t answer all the phones.____________________________________________________________ 11.He didn’t see me in the street yesterday.________________________________________________________ 12.Did Mike break the glass? ___________________________________________________________________

二、用正确的时态和语态填空

1.It is a fine day.The sun _________________(shine)brightly.2.The students _______ often __________(tell)to take care of their desks and chairs.3.Mr Brown _________________(live)in Beijing since he came to China.4.The Smiths _________________(watch)TV at this time last night.5.The teacher said that the moon __________(go)round the earth.6.Apples _________________(grow)in this farm.7.Russian _____________(learn)as the second language by some students in China.8.The Young Pioneers will go to the zoo if it ______________(not rain)this Sunday.9.Listen!They _______________(talk)about the new film.10.My mobile phone _______________(steal)on a bus last week.11.The Greens _________________(watch)TV now.12.He said that he ___________________(ring)me up when he got there.13.We _________________(learn)English for about three years.14.The red skirt _____________(cost)the girl forty yuan.15.You _______________(can catch)the early bus if you get up early.16.I’ll go home as soon as I ______________(finish)my homework.17.The cinema _______________(bulid)in 1985.18.Most science books are _________________(write)in English.三、按要求改写下列句子

1.Is tea grown in South China？（改为主动语态）_______ people _________ tea in South China 2.I am given a present by my parents every year．（同义句转换）

A present __________ _________ __________ __________by my parents every year练习． 3.People use metal for making machines.(改为被动语态)Metal __________ ___________ __________making machines.4.He asked me do that for him.(改为被动语态)I _________ __________ __________ _________ that for him.5.Did they construct reconnect here a year ago?(改为被动语态)__________ a reconnect ____________ here by them a year ago? 6.We call the game “Lianliankan”.(改为被动语态)The game __________ ___________ “Lianliankan” by us.

第五篇：一般过去时与现在完成时,过去完成 的区分

一般过去时与现在完成时用法比较

过去时表示过去某时发生的动作或单纯叙述过去的事情，强调动作；现在完成时为过去发生的，强调过去的事情对现在的影响，强调的是影响。

过去时常与具体的时间状语连用，而现在完成时通常与模糊的时间状语连用，或无时间状语。一般过去时的时间状语:

yesterday, last week，…ago, in1980, in October, just now, 具体的时间状语

共同的时间状语:

this morning, tonight, this April, now, once，before, already, recently，lately

现在完成时的时间状语

for, since, so far, ever, never, just, yet, till / until, up to now, in past years, always,现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如live, teach, learn, work, study, know.过去时常用的非持续性动词有come, go, leave, start, die, finish, become, get married等。举例：

I saw this film yesterday.（强调看的动作发生过了。）

I have seen this film.（强调对现在的影响，电影的内容已经知道了。）

Why did you get up so early?（强调起床的动作已发生过了。）

Who hasn't handed in his paper?（强调有卷子，可能为不公平竞争。）

She has returned from Paris.她已从巴黎回来了。

She returned yesterday.她是昨天回来了。

He has been in the League for three years.(在团内的状态可延续)

He has been a League member for three years.(是团员的状态可持续)

He joined the League three years ago.(三年前入团，joined为短暂行为。)I have finished my homework now.---Will somebody go and get Dr.White?

---He's already been sent for.句子中如有过去时的时间副词（如 yesterday, last, week, in 1960）时，不能使用现在完成时，要用过去时。

（错）Tom has written a letter to his parents last night.（对）Tom wrote a letter to his parents last night.一般过去时与过去完成时

一般过去时与过去完成时的 11 个测试点

一般过去时与过去完成时都可表示过去的动作或状态，它们既有联系又有区别，极易混淆。

1.表示过去未实现的希望、计划或打算，用过去完成时。常用的动词有 intend , mean , hope , expect , suppose , think , want 等。

I had meant to call on you , but was prevented from doing so.我本打算给你打电话，但被其它事给耽搁了。

We had hoped to be able to come and see you.我们本来打算能来看望你。

They had wanted to help her but couldn’t get there in time.他们本想帮她的忙，却没有及时赶到那里。

过去完成时的这种用法也可以换为：

Had + hoped(…)= hoped + to + have + done

I had wanted to see you , but found you were out.= I wanted to have seen you , but found you were out.2.在由 told , said , knew , heard , thought 等动词后的宾语从句中常用过去完成时。She said she had never been to Paris.3.注意在句型 hardly … when , no sooner … than 的主句中用过去完成时。当 hardly 和 no sooner 谓语句首时主句要用倒装结构。

She had hardly sat down when she heard her name called by the monitor.= Hardly had she sat down when she heard her name called by the teacher.4.表达过去两个动作如第一个动作完成后才能引起第二个动作，则第一个动作用过去完成时，第二个用一般过去时。

When he had drunk all the wine , he left his house.When he reached home , he found his house had been broken into and lot of things stolen.5.若句中有表示过去的时间时，在由 had rather ； I wish 后的宾语从句中用过去完成时。I would rather you had told me the truth last time.我宁愿你上次把实话告诉我。

She wished she had been there yesterday.(事实是： She wasn’t there)

6.在与过去相反的虚拟语气中，条件句用过去完成时。特别要注意该结构省if 后的倒装结构。If John had studied hard last term , he would have made great progress.Had he known that you were busy last week , he wouldn’t have given you so much trouble.7.在过去某时之前的继续动作，表示某事继续到过去某时已有一段时间，则用过去完成时，并与for , since 等词连用。

He had been ill for a week when he was went to the hospital.他被送医院时已病了一星期了。He said he had worked in that factory since 1984.他说他从 1984 年以来 一直在那家工厂工作。

8.两个或两个以上的动作，用 and , then 或 but 等连接，按照动作发生的顺序表达时，用一般过去时，表示过去发生的连续的动作。

The man got up , put on his cap and went away.那人站了起来，戴上帽子走了。

I lost the hat which I had bought.9.过去完成时以过去某时间为起点，表示过去某一时间或动作之前已经发生或完成的动作或存在的状态。也就是，过去完成时是一个相对的时态，表示的是“过去的过去”，只和过去某时间或某动作相比较时才能用到它。

一般过去时以现在时间为起点，表示过去发生的动作或存在的状态。He died three years ago.他三年前死了。

The film had already begun when I got to the cinema.我到达电影院时，电影已经开始了。

We had learned 1000 English words by the end of last term.到上学期末我们已学了 1000 个英语单词。

10.在间接引语中，以过去完成时代替直接引语中的一般过去时和现在完成时。但是如果叙述的是历史事实时，只用一般过去时，不用过去完成时。

She said that she had seen the film.她说她已看过这个电影。

He asked me whether I had done it the night before.他问我昨天是否做了那件事。

Our teacher told us that Columbus discovered(不用 had discovered)America in 1492.我们老师告诉我们哥伦布是 1492 年发现美洲的。

由 before , after , as soon as 等引导的从句中，由于这些连词本身已表示出时间的先后比较紧凑，所以可用过去时来代替过去完成时。

After he closed the door , he left the house.他关上门，离开了屋子。

We(had)arrived home before it rained.下雨前我们到家了。

试比较下列两句的时态：

The train started just before we reached the station.The train had gone when we arrived the station.另外，常与过去完成时连用的时间状语有 already , still , yet , just , ever , never , hardly , scarcely 以及由 by , before , since , for ,after , until , as soon as 等构成的短语或从句。

常与一般过去时连用的时间状语有： yesterday , last night , then , at that time , just now , a few days ago, in 1960 , once upon a time 以及由when , while , after , before 等引导的表示过去时间的状语从句。

现在完成时与过去完成时的比较用法

一：两种完成时的主要用法

A现在完成时的主要用法：

1)表示过去发生或已经完成的某一对现在造成的影响或结果的动作。例如：

-Haveyouhadyourlunchyet?

-Yes,Ihavejusthadit.2)表示过去已经开始，一直持续到现在的动作或状态。可以表示从过去从某一事可延续到现在(包括”现在”在内)的一段时间的状语连用.此时动词多是延续性动词。例如：

Ihavebeenat this schoolfor2years.-Iamsorrytokeepyou waiting.-Oh, notatall.Ihavebeenhereonlyfewminutes.B过去完成时的主要用法如下：

1)过去完成时至一个动作或状态在过去某一时间或动作以前已经完成或结束，即发生在”过去的过去”。例如：

When Iwokeup, ithasstopraining.2)过去完成时是一个相对的时态，表示“过去的过去”，只有和过去某一时间或某一动作相比较时才能使用。

Hetoldmehehadwrittenanewbook.3)过去完成时通常需要与一个表示过去的时间状语连用，它不能离开过去时间而独立存在。此时多与 already/yet/still/before/just/never等时间adv及 by/at/before/until等引导词的组或从句连用。

Before dark yesterday we had repaired all the broken desks.4)过去完成时某一动作或状态在过去某时间之前已经开始，一直延续到这已过去时间，而且动作尚未结束，仍然有继续下去的可能。

By the end of last year he had taught in this school for 20 years.5)在wish引导的宾语从句中，若表示过去的一种难以实现的愿望时，常用过去完成时。I wish had not made a single mistake in last exam.6）动词如hope/expect/think/mean/suppose/want等后接不定式或宾语从句，若表示过去为实现的愿望，打算或意图，尝使用过去完成时，其后的分句则通常用一般过去时。

I had wanted to see you, but I was too busy to get away.二 两种时态的判断依据

A.现在完成时的判断依据：凡表示过去发生或已经完成且对现在造：凡表示过去发生或已经完成且对现在造成影响或结果的动作；或过去已经开始，一直持续到现在的动作或状态，可以用现在完成时。

I have washed my clothes.B.过去完成时判断的依据：

1)过去完成时的句子中一般都以一个明确的时间或装于从句来表示过去某一个时间点；而在含有宾语从句的句子中，主语的动词就表示过去的某一时间点。也就是说时间点就是过去完成时判断依据.Jims aid that he had seen the film twice.注意过去的过去这种逻辑关系有时需要通过上下文体现,而不一定受时间状语的限制.There had been someone in our room just now, because I noticed a burning cigarette end on the floor when we opened the front door.2)过去完成时常用于一些固定的关系中.如意为”一„„就”,其主句多使用过去完成时.Hardly had he begun to speak when the audience interrupted him.3)在没有明确的过去时间状语标志时,位于东磁发生的时间的先后顺序依据上下文来判断;后发生的用一般过去时.Jim had not studied hard, so he did not pass the exam.4)当两个获两个以上接连发生的动作用and或but连接时,安事件发生顺序,可用一般过去时来代替过去完成时;另外,在等引导的从句中,由于这些词本身已经表示出时间的先后, 所以也可以用过去时来代替过去完成时.He entered the room, turned on the light and sat down.I(had)called him before left here.