初中英语中的8个时态 的定义是什么？

初中英语需要学习的八个是时态是什么

英语时态分为16种：一般现在、一般过去、一般将来、过去将来时，以及这四者的进行时、完成时和完成进行时


一、 一般现在时：

1.概念：经常、反复发生的动作或行为及现在的某种状况。

例句：. It seldom snows here.

He is always ready to help others.

Action speaks louder than words.

二、 一般过去时：

例句：She often came to help us in those days.

I didn't know you were so busy.

三、 现在进行时：

1.概念：表示现阶段或说话时正在进行的动作及行为。

例句： How are you feeling today?

He is doing well in his lessons.

四、 过去进行时：

1.概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作。

例句：I've written an article.

The countryside has changed a lot in the past few years.

六、 过去完成时：

1.概念：以过去某个时间为标准，在此以前发生的动作或行为，或在过去某动作之前完成的行为，即“过去的过去”。

例句：As soon as we got to the station, the train had left.

By the end of last month. We had reviewed four books

七、 一般将来时：

1.概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事。

例句：They are going to have a competition with us in studies.

It is going to rain.

八、 过去将来时：

1.概念：立足于过去某一时刻，从过去看将来，常用于宾语从句中。
2.时间状语：the next day(morning, year…),the following month(week…),etc.
3.基本结构：was/were/going to + do；would/should + do.
4.否定形式：was/were/not + going to + do;would/should + not + do.
5.一般疑问句：was或were放于句首；would/should 提到句首。
6.例句：He said he would go to Beijing the next day.
I asked who was going there .

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Ⅰ、 一般现在时
1、概念：1）表示经常性或习惯性的动作，常与表示频度的时间状语连用。
时间状语：always, usually, often, sometimes, seldom, never, every day, twice a week, on Sunday, etc.（提问用How often）
例：I leave home for school at 7 every morning.
2） 客观真理，客观存在，科学事实。
例：The earth moves around the sun. 地球绕太阳转动。
Shanghai lies in the east of China. 上海位于中国东部。
3） 格言或警句。例：Pride goes before a fall. 骄者必败。
注意：宾语从句中，即使主句是过去时，从句谓语是客观真理也要用一般现在时。
例：Columbus proved that the earth is round. 哥伦布证实了地球是圆的。
2、结构：表状态 S+ am/is/are+ P （句中有实义动词不用be）
表动作 S+V原+O （若主语是单三人称，谓动加s/es。）
3、句式变化：
变为一般疑问句，有be动词的把be动词提到主语前；无be动词的在主语前加do/does，谓语动词变为原形。
变否定句，有be动词的在be动词后加“not”；无be动词的在主语后加don’t/doesn’t，谓语动词变为原形。
例： ① They are in the classroom. 一般疑问句：Are they in the classroom? Yes, they are./No, they aren’t. 否定句：They aren’t in the classroom.
② He often waters the flowers . 一般疑问句： Does he often water the flowers?
Yes, he does. / No, he doesn’t. 否定句：He doesn’t often water the flowers
Ⅱ、 一般过去时
1、 概念：1）表示在确定的过去时间里所发生的动作或存在的状态。
常用时间状语：yesterday, the day before yesterday, last week, just now, an hour ago, the other day, in 1982. at the age of 5, one day, long long ago, etc.
例：Where did you go just now?
2）表示在过去一段时间内，经常性或习惯性的动作。
例：When I was a child, I often played football in the street.
2、结构：表状态 S+ was/were+ P
表动作 S+V过去式+O （注：句中有实义动词不用be）
3、句式变化：
变一般疑问句，有be动词的把be动词提到主语前；无be动词的在主语前加did，谓动变为原形。
变否定句，有be动词的在be动词后直接加“not”；无be动词的在主语后加didn’t，谓动变为原形.
例：① She was in Xi’an last month. 一般疑问句：Was she in Xi’an last month? Yes, she was. /No, she wasn’t. 否定句：She wasn’t in Xi’an last month.
② Danny grew a rose just now, 一般疑问句： Did Danny grow a rose just now?
Yes, he did. / No, he didn’t. 否定句：Danny didn’t grow a rose just now,
Ⅲ、 现在进行时：
1. 概念：表示现阶段或说话时正在进行的动作。
时间状语：now, at this time, ,以及有look, listen时。
例：Listen！The birds are singing.
2、结构：S + am/is/are + doing
3、句式变化：
变疑问，把am/is/are提到主语前，其它不变； 变否定，在am/is/are后直接加“not”。
例：① I am writing a letter now. 一般疑问句： Are you writing a letter now? Yes, I am. /No, I’m not. 否定句：I am not writing a letter now. (注意：am和not不能缩写。)
② The boys are playing football. 一般疑问句： Are the boys playing football?
Yes, they are. / No, they aren’t. 否定句：The boys aren’t playing football.
Ⅳ、 过去进行时：
1. 概念：表示过去某段时间或某一时刻正在发生或进行的动作。
.时间状语：at this time yesterday, at that time，at 8:00 yesterday,或有when / while引导的时间状语从句等。
例：We were having an English class at 9:30 yesterday morning.
I was reading a book while my mother was watching TV.
2、结构：S + was/were + doing
3、句式变化：
变疑问句，把was/were提到主语前，其它不变； 变否定句，在was/were后直接加“not”其它不变。例：①At that time they were working in the garden. 一般疑问句： Were they working in the garden at that time? Yes, they were. / No, they weren’t. 否定句： At that time they weren’t working in the garden.
② When he came in, I was reading a newspaper. 一般疑问句：When he came in, were you reading a newspaper? Yes, I was. / No, I wasn’t. 否定句：When he came in, I wasn’t reading a newspaper.
Ⅴ、一般将来时
1. 概念：表示将要发生的动作或存在的状态。
时间词:tomorrow, tomorrow morning, at seven o'clock tomorrow evening, next year, this year, at the end of this term, from now，in ten minutes, in 2025
例：They will do an experiment tomorrow afternoon.
Brian is going to draw twenty pictures at the end of this term.
2、 结构：S +will+ V原+其他
(will 可改为be going to ,当主语是第一人称时will可用shall)
例：Which paragraph shall I read first？ 我先读哪一段呢？
Will you/(Are you going to）be at home at seven this evening?
3、 句式变化：
变疑问，把will提到主语前，其它不变； 变否定，在will后直接加“not”，其它不变。
例; She will drive to Beijing next week. 一般疑问句： Will she drive to Beijing next week? Yes, she will. / No, she won’t. 否定句：She won’t drive to Beijing next week.
★ be going to /will+ V原
表示a. 主语的意图，即将做某事。例：What are you going to do tomorrow?
b. 计划，安排要发生的事。例：The play is going to be produced next month。
c. 有迹象要发生的事。例：Look at the dark clouds, there is going to be a storm.
★ be +不定式：表示将来，按计划或正式安排将发生的事。例：
We are to discuss the report next Saturday. 我们下星期六将讨论这份报告。
★ be about to + V原：意为马上要做某事。
例：He is about to leave for Beijing. 他马上要去北京。
注：be about to do 不能与tomorrow, next week 等表示明确的将来时间状语连用。
★ 一般现在时表将来
1）下列动词come, go, arrive, leave, start, begin, return的一般现在时可以表示将来，主要用来表示在时间上已确定或安排好的事情。例如：
The train leaves at six tomorrow morning. 火车明天上午六点开。
When does the bus star? It stars in ten minutes. 汽车什么时候开？十分钟后。
2）以here, there等开始的倒装句，表示动作正在进行。例如：
Here comes the bus. = The bus is coming. 车来了。
There goes the bell. = The bell is ringing. 铃响了。
★ 用现在进行时表示将来
come, go, arrive, leave, start, begin, return等终止性动词可用现在进行时表示将来。
例：I'm leaving tomorrow. 明天我要走了。
Are you staying here till next week? 你会在这儿呆到下周吗？
Ⅵ、过去将来时
1.概念：表示站在过去看将要发出的动作或者存在的状态。因时间的参照点是过去的某一时间，常用于宾语从句中,或根据上下文语境确定。
2.结构：S +would+ V原+其他
S +was/were going to + V原
例：He said that he would have an exam next Friday.
Jenny asked who was going to give them a report.
I knew that he wouldn’t move to Japan with his parents next year.
Ⅶ、 现在完成时：
1. 表示：①过去发生或已经完成的动作对现在造成的影响或结果。时间词：ever, never, already, yet, before, just, recently/ lately(最近)， in the past few years
2. ②或从过去已经开始持续到现在的动作或状态。 时间词：for + 时间段，since +过去时间点/从句。（提问用How long）
例：The countryside has changed a lot in the past few years.
He has learned French for two years.
2.结构：S + have/has + done
3. 句式变化：
变疑问，把have/has提到主语前,其它不变； 变否定，在have/has后直接加“not”。
例：① I've already written an article. 一般疑问句： Have you written an article yet? Yes, I have. / No, I haven’t. 否定句I haven’t written an article yet.
② Li Ming has lived in Taiyuan since 1993.
一般疑问句： Has Li Ming lived in Taiyuan since 1993? Yes, he has. / No, he hasn’t. 否定句：Li Ming hasn’t lived in Taiyuan since 1993.
★ 比较一般过去时与现在完成时
1）一般过去时表示过去某具体时间发生的动作或单纯叙述过去的事情，强调动作；现在完成时则强调过去发生的动作对现在的造成影响，强调的是结果。
2）一般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。注意：有时间段的句子用现在完成时，有时间点的句子用过去时。
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? （强调有卷子未交，指结果）
He joined the League three years ago. （强调加入这一动作，表示时间点）
He has been a League member for three years. （是团员的状态可持续，表示时间段）
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.
Ⅷ、 过去完成时：
1.概念：以过去某个时间为标准，在此之前发生的动作或行为；或过去某个时间前一个持续发生的动作，即“过去的过去”。 句中必须有过去的某一时间做参照点，常用于在told, said, knew, heard, thought等动词后的宾语从句中；before, after, by the time, until , when, once, as soon as等引导的时间状语从句中；或根据上下文语境确定。
----|------------|-----------|---->
过去以前 过去 现在
例：She said （that）she had never been to Paris.
By the time he was twelve, Edison had began to make a living by himself.
When the police arrived, the thieves had run away.
2.结构：S + had + done
3.句式变化：
变疑问，把had提到主语前，其它不变； 变否定，在had后直接加“not”。
例：He had finished his homework before he went to play outside.
一般疑问句：Had he finished his homework before he went to play outside.
Yes, he had. / No, he hadn’t. 否定句：He hadn’t finished his homework before he went to play outside.
注意：1. had hardly… when 还没等…… 就……。例如：
I had hardly opened the door when he hit me. 我刚打开门，他就打了我。
2.had no sooner…than 刚…… 就……。例如：
He had no sooner bought the car than he sold it.
他刚买了这辆车，转眼又卖了。
初中英语时态也就这些，其实这方面资料很多的，你可以自己去买本书或者找找看。
希望对你有帮助

初中英语动词时态
1、一般现在时
主要用于下面几情况:
1) 描述当前时间内经常出现、反复发生的动作或存在的状态。
在这种情景中,句子常带有表示频率的时间状语:always , everyday , often , once a week (month , year , etc.) , sometimes , seldom , usually等等,以表示句中的动作或状态是习惯性的、经常性的。例如:
They raise ducks as a sideline .他们以养鸭为副业。
She doesn't often write to her family, only once a month. 她不常给家里写信,仅一月一封而已。
I cycle to work every day .我每天骑自行车上班。
It seldom rains here .这儿很少下雨。
2)仅为了描述状态、性质、特征、能力等等。
这里的目的是为了"描述现阶段的动作或状态",其重点"不是强调动作发生的时间、或进行的状态"。例如:
He can speak five foreign languages .他能说五种外语。
That is a beautiful city .那是座美丽的城市。
Changjiang River is one of the longest rivers in the world. 长江是世界上最长的河流之一。
She majors in music .她主修音乐。
All my family love football .我全家人都喜欢足球。
My sister is always ready to help others . 我妹妹总是乐于助人。
3) 陈述客观事实、客观真理。
顾名思义,客观的情况是"没有时间概念"的;也"不会在意动作进行的状态"。例如:
The sun rises in the east .日出东方。
The earth goes around the sun .地球绕着太阳转。
Ten minus two is eight.十减二等于八。
Light travels faster than sound .光的速度比声音的速度快。
The United States lies by the west coast of the Pacific Ocean. 美国位于太平洋西岸。
4) 根据英文语法规定,当主句的谓语动词是一般将来时,那么时间或条件状语从句的谓语动词只能用一般现在时来表示将来要发生的动作。例如:
I'll tell him the news when he comes back. 他回来时,我将告诉他这个消息。
If you take the job , they will talk with you in greater details.
如果你接受这份工作,他们将和你谈谈细节。
用于一般现在时的副词,除了上面提到的一些表示频率的以外,常见的还有:now, today , nowadays等等。
2、一般过去时
主要是用来描述在过去某个时候发生的动作或存在的状态。它也可以用来表示在过去某段时间里经常发生的习惯性动作。这一点在表达意义上与一般现在时相同,只是所在的时间区域不同而已。由于它的主要作用如此,所以在使用一般过去时的句子里常常有一个意义较具体的过去时间状语。这也是它与现在完成时的最大区别之一。
一般过去时由谓语动词的过去式表示,也就是说动词词末要加-ed(除不规则动词外)。常和一般过去时连用的过去时间状语有:last night (week ,
month , year , century , etc.) , yesterday , the day before yesterday , yesterday morning ( afternoon , evening ) , in 1999 , two hours ago ( one week ago , tree years ago , …)等等。
使用一般过去时,在某种意义上说就是要强调动作或状态发生或存在于过去的某个时候。"过去"的时间概念有两层意思:一是指"现在某个时间"以前的时间;二是指"说话、写文章的那个时间点"以前的时间,在这个意义上,"现在的那个时间点"是很小很小的,甚至于小到无法量化的程度。例如:
He got his driving license last month. 他上个月拿到了驾照。
--Where's Jim? 吉姆在哪里?
--He just went out.他刚刚出去。
3、一般将来时
主要用来描述将要发生的动作或存在于未来的情况。这里所说的"将来时间"是指"说话、写文章那一刻以后的时间"。它的表示方法主要有如下几种:
1)shall / will + 动词原形这种表示方法是说,动作在现在或目前还未发生,要在将来的某个时间内发生;它没有主观性,是"纯粹的将来动作"。例如:
I shall / will not be free tomorrow .我明天没空。
He will arrive here this evening .他今晚抵达这里。
2) be( am / is / are ) + going +不定式
这种表示方法主要是说明A)"说话人的意图、打算";B)"某种可能性" 。例如:
A) He is going to spend his holidays in London . 他打算在伦敦度假。
Who is going to speak first? 谁先发言?
B) It is going to rain soon .马上要下雨了。
Is he going to collect any data for us? 他会帮我们收集资料吗?
If you go to New Zealand, you are going to like the place. 如果你去新西兰,你会喜欢上那个地方的。
3) be( am / is / are ) + 不定式表示方法描述两钟情况:
按计划安排要发生的动作,这个动作发生的时间一般不会很远; 要求或命令他人做某事。例如:
A) The new bridge is to open to traffic in three days. 新桥三天后通车。
The factory is to go into production before National Day. 这家工厂国庆节前投产。
B) You are not to bring any mobile communication means into the exam-room . 任何移动通讯工具都不得带入考场。
You are to stay home until your mother comes back. 你妈回来之前你不要出去。
4) 用一般现在时或现在进行时(限于某些动词)表示按计划安排要发生的事。这种表示方法实际上已经在上面"一般现在时之4)"中谈过。主要强调"按计划安排要发生的事"。例如:
Do you get off at the next stop? 你下一站下车吗?
The plane takes off at 11:00 a.m. 那架飞机上午十一点起飞。
Mr. Reider is leaving for New York next week. 里德先生下周动身去纽约。
4、过去将来时
表示过去的某时以后将要发生的动作。但这个"将来"时间绝不会延伸到"现在";而仅限于"过去时间区域内"。由此可以看出,含这个时态的句子常带一个表示"过去某个时间点"的状语。这个状语或是一个短语,或是一个句子。这个时态常用于:
A)宾语从句或间接引语中;B)表示过去习惯性的动作;C)表示过去情况中的"愿望"、"倾向",多用于否定句。例如:
A) When I thought about it , I wondered what their reaction would be . 当我考虑这件事时,我想知道他们的反应是什么。
She told me that she would go on trip to Europe the next day. 她告诉我,她第二天要去欧洲旅行。
He didn't expect that we would all be there. 他没料到我们会全在那儿。
B) During that period , he would do morning-exercises every day. 在那段时间,他每天早锻炼。
Whenever he had time, he would help his mother with some housework. 无论他什么时间有空,他总是帮他妈妈干点家务活。
C) No matter how difficult the work was , he would keep on doing it until he accomplished it . 不管工作有多难,他总会坚持不懈地把它干完。
They knew that we would never permit such a thing. 他们知道我们绝不会允许发生这样的事。
Even after the lecture ended, the audience would not leave . 甚至在讲座结束之后,听众仍不肯离去。
5、现在进行时
主要用来描述"说话、写文章的当刻"正在发生的动作,或是"现阶段"一直在进行的动作。它适用于下面的情况:
1)"说话、写文章的当刻"正在发生的动作。例如:
They are having a football match .他们正在赛足球。
She is writing her term paper. 她正在写学期论文。
Someone is asking for you on the phone. 有人找你听电话。
2)"现阶段"一直在进行的动作。这种情况并不是说某个动作在说话的那会儿正在发生,而是说某个动作在当前一段时间内一直在进行着,或是重复地发生着。例如:
He is preparing for CET Band Six. 他在为大学英语六级考试作准备。
How are you getting along with your new job? 你那份新工作干得怎么样?
3)表示说话人的情感,如:赞许、批评;喜欢、厌恶等。这时的动作并不是正在发生或进行,而是表示经常性,相当于"一般现在时"所描述的情况。例如:
He is always thinking of others , not of himself . (表示赞许)他总是为他人着想,而不为自己。
She is often doing well at school. (表示满意)她在学校学习挺不错的。
Are you feeling better today? (表示亲切)你今天觉得好一些吗?
One of my roommates is constantly leaving things about.(表示不满)我的一个室友老是乱扔东西。
Some sellers are often knocking at our door and promoting their products to us .(表示不喜欢) 有些推销员老是敲我家的门,向我们推销他们的产品。
4)表示在近期按计划或安排要发生的动作,用于这种情况仅限于少量的动词,如:go , come , leave ,arrive , see , have , lunch( 吃午饭 ) , return, dine ( 进餐,尤指晚餐 ) , work , sleep , stay , play , do , wear( 穿,戴 ) 等。例如:
I'm dinning out with my friends this evening. 今晚我将和朋友在外面吃饭。
An American professor is giving a lecture this afternoon. 今天下午一位美国教授要来作报告。
We are having a holiday next Wednesday. 下周三我们放假。
Are you staying here till next week? 你要在这儿呆到下星期吗?
6、过去进行时
主要表示在过去的某个时间点上正在发生、进行的动作。由于它的定义是表示在过去的某个时间点上正在发生、进行的动作,所以,句子常带有一个表示"过去某个时间点"的状语。这个状语可能是短语,词组,或是一个从句。也可能是通过上下文来表达这层意思。过去进行时主要用于下面的情景中:
1)表示在过去某时刻正在进行的动作,例如:
At this moment yesterday, I was packing for camp.昨天这个时候,我正在收拾东西去露营。
When I came to see her last time, she was writing an article.上次我来看她的时候,她正在写一篇文章。
What were you doing at eight last night ? 昨晚八点钟你在做什么?
2)用于故事的开头,交代故事发生的背景情况。
过去进行时所描述的动作是"正在进行",所以,在这种情景中用"过去进行时"可以给读者一种"动感",从而能使文章更加生动活泼。例如:
One night, he was typing in his study . Suddenly , a man broke into his house and cut off the electricity … .一天晚上,他正在书房里打字。突然,一个人闯进屋来,切断了电源……
3)(仅限少数动词)表示在过去的未来时间要发生的动作。例如:
When National Day was coming near , they began to make a plan for the holiday .国庆节即将来临的时候,他们开始制订度假计划。
She told me that she was going to Hainan for her holiday. 她告诉我她将去海南度假。
My friend said to me that he was lunching with one of his customers that day .我朋友对我说,他今天要与他的一位客户一块儿吃午饭。
We left there when it's getting dark. 天快黑的时候,我们离开了那儿。
7、将来进行时
主要表示:A)在将来某时候正在进行的动作;B)预计、安排即将发生或势必发生的动作。例如:
A)在将来某时候正在进行的动作:
You can have a meeting in my office on Friday . I won't be using it. 星期五你可以在我的办公室开会。那会儿我不用它。
What will you be doing tomorrow morning? 明天上午你做什么?
It won't be long before that we will be making a new computer for more advanced calculation. 不久我们就要造一部新计算器进行更高级的运算。
I can't go to the party tonight . I'll be seeing off a friend .今晚我不能参加聚会了。我要给一位朋友送行。
B)预计、安排即将发生或势必发生的动作:
在这里,将来进行时与一般将来时很接近,但是前者强调动作"按计划、安排要发生;间或也表示委婉、客气",而后者只表示"动作会在未来时间发生"。
We shall be meeting at the school gate .我们在校门口见面。
What shall we be doing next ? 我们干什么?
If you don't do so , you will be facing great difficulties.你如果不这样做就会面临很大的困难。
Shall I be interrupting you if I stay here for a while? 要是我在这儿呆一会儿,会干扰你们吗?
8、现在完成时
对于初接触现在完成时的人来说,往往会产生一种茫然,因为它似乎与一般过去时相似。那就是,这两种时态描述的动作都始于过去。其实不然,现在完成时主要表示,发生在过去的动作延续到现在刚刚完成、或许还要延续;侧重于这个动作对现在带来的结果、产生的影响、积累的总和等等。而一般过去时则只不过是表示动作发生在过去的什么时候。弄清了这一区别,就很容易理解现在完成时了。它主要适用于下面的几种情况:
1)表示截止现在业已完成的动作
By now, I have collected all the data that I need .到现在为止,我已收集到了我所需的全部资料。
She has read 150 pages today .她今天已看了150页。
We haven't met for many years .我们已多年没见了。
They have developed a new product .他们研制成功了一种新产品。
2)表示发生在过去而对现在产生影响、带来结果的动作
Have you had your dinner? 你吃晚饭了吗?
She has been to the United States. 她已去美国了。
You have grown much taller.你长高了许多。
3)表示过去发生的动作持续到现在,并可能还要延续
It has been five years since he joined the army .他参军五年了。
They have learned English for eight years .他们已学了八年的英语了。
So far we've only discussed the first five chapters.至今我们还只讨论了前五章。
几点注意
1)一个句子应该用什么时态只能取决于它需要表达的意思,以及它所处的语言环境。例如:
He speaks English .(一般现在时,说明动作发生的经常性。)
He spoke English when he was in New Zealand .(一般过去时,说明动作发生的时间。)
He is speaking English.(现在进行时,说明动作正在进行。)
He has spoken English for three years since he came to the USA.(现在完成时,这里说明动作的总和。)
He has been speaking English since he came to the USA. (现在完成进行时,强调动作的连续性。)
2)在含有时间状语从句或条件状语从句的主从复合句中,如果主句的谓语动词是一般将来时,那么从句的谓语动词就只能用一般现在时来表示将来时;如果主句的谓语动词是过去将来时,那么从句的谓语动词就只能用一般过去时来表示过去将来时。
例如:I will not play tennis if it rains tomorrow.
I would not play tennis if it rained the next day.
3) 有些动词表示无法持续的动作,它们一般不宜用于进行时态中。这类动词常见的有:be , believe , consist , find , forget , hate , have , hope , hear , know , like , love , notice , prefer , remember , see , seem , smell , suggest , taste , understand , want , wish , sit down , stand up 等等。
Be动词若是用于进行时态,可表示暂时、短暂的情况或表现。例如:
Tom is being a good boy today .汤姆今天很乖。
He is being childish .他这样做是耍孩子气。
You are not being modest .你这样说不太谦虚。
4)关于现在完成时的时间状语问题.
A. 凡是"完成时态"都表示,不知道也不管动作发生的具体时间, 所以在使用现在完成时的句子里,不可以带有表示具体过去时间的状语,如:yesterday , last week ( month , year , etc. ) , two weeks ago , in 1999等;但常和有些副词连用,如: just , before , already , often , never , ever , not…yet , always等等。
B. 在以when提问的特殊疑问中不能用现在完成时。另外,ago不能用于现在完成时的句子里,因为它表示从现在算起的以前某个时间,属于表示具体过去时间的状语。但是可以用before 来表示"以前"的意义,因为它只表示"以前",而不知什么时候的以前。
C. 如果是不表示连续性的动词用于现在完成时的句子,不可以和以for表示的"一段时间"的状语连用。在这种情况下,应该用"It has been … ;since…"的句式来表达。如:
He has joined the army for five years. (错误)
It has been five years since he joined the army.(正确)
看完这些，你的英语时态都没问题了。不但要看，还得记住，灵活运用。