i haven't written [not writte]for such along time 这里为什么用过去完成时 帮我分析I have been very busy with study这句也是the doctor told[tell]me i have to balance my work.这句又用过去时 为什么呢?帮我区分一下过去

i haven't written [not writte]for such along time 这里为什么用过去完成时 帮我分析I have been very busy with study这句也是the doctor told[tell]me i have to balance my work.这句又用过去时 为什么呢?帮我区分一下过去
i haven't written [not writte]for such along time 这里为什么用过去完成时 帮我分析
I have been very busy with study这句也是
the doctor told[tell]me i have to balance my work.这句又用过去时 为什么呢?帮我区分一下过去完成时跟过去时有什么区别 基础差

i haven't written [not writte]for such along time 这里为什么用过去完成时 帮我分析I have been very busy with study这句也是the doctor told[tell]me i have to balance my work.这句又用过去时 为什么呢?帮我区分一下过去
现在完成时（Present perfect）是过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在的动作或状态.（对现在有影响,延续到现在还有可能延续到将来）
i haven't written [not writte]for such along time 这里是我很长时间没有写了 在过去的时间 到现在都没有写了 可能延续到将来 因此是现在完成时态
同理I have been very busy with study
至于一般过去时表示过去某个时间发生的事、存在的状态或经常发生的动作.说话的侧重点只在于陈述一件过去的事情,不强调对“现在”产生的影响
the doctor told[tell]me i have to balance my work. 医生只是告诉我我需要平衡下我的工作 只是侧重医生告诉我这个事实而已 不对现在有影响.因此用一般过去时
. 两种时态的区分
（1）一般过去时的谓语动词用过去式,而现在完成时的谓语基本构成是“助动词have /has +过去分词”.如：
（2）一般过去时通常与表示过去的时间状语连用.如：yesterday, last week, two years ago, just now, in 2002等；而现在完成时则常与just, already, ever, never等副词和these days, this week, since..., for...等表示一段时间的状语连用.
看看以下的几组句子,有什么区别?
① Have you seen the film?（A）
Did you see the film?（B）
[说明] 你看过这部电影吗?（A）句强调的是被问者对剧情是否了解；（B）句强调的是看这部电影的动作是否发生过,并不强调是否知道其内容.
② How has he done it?(A)
How did he do it?(B)
[说明]他是怎么做的这件事?(A)句强调的是他做这件事的方式对现在产生了某种影响；(B)句单纯的
询问做这件事的方式.
③ He has lived in Beijing for 8 years.（A）
He lived in Beijing for 8 years.（B）
[说明]他在北京住了8年.（A）句讲的是到目前为止他在北京住了8年,可能还会继续在北京住下去.(B)句讲的是他在北京住过8年,现在不在北京了.
希望能够帮到楼主

i haven't written [not writte]for such along time
I have been very busy with study这两句都是现在完成时，现在完成时的用法
have(has)+过去分词(done)
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...

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i haven't written [not writte]for such along time
I have been very busy with study这两句都是现在完成时，现在完成时的用法
have(has)+过去分词(done)
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 lost my wallet.(含义是:现在我没有钱花了.)
Jane has laid the table.(含义是:已可以吃饭了.)
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,持续到现在的情况,常与for,since连用.
Mary has been ill for three days.
I have lived here since 1998.
3. 现在完成时往往同表示不确定的过去时间状语连用,如already, yet, just, before, recently, 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
4. 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 Beijing
I 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.
5. 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, now, 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 bee 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.
6. 现在完成时表示现在之前业已完成的动作,虽然其效果或影响仍然存在但已不再继续,但是有一些现在完成时的句子,在后面加上for+一段时间,则现在完成时的动作就表示延续性.
Thomas has studied Russian. (现在不再学俄语)
Thomas has studied Russian for three years. (=Thomas began to study Russian three years ago, and is still studying it now.(同第2点用法第一个例句)
7. 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.
===================
现在完成时的“完成用法”和“未完成用法”
1.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。
例如：He has turned off the light.他已把灯关了。(动作结束于过去，但说明的是现在的情况--灯现在不亮了。)
现在完成时"完成用法"的特点是动作不延续，因此，该时态只能与表示不定的过去时间状语(如：already，yet，before，recently等)、频度时间状语(如：never，ever，once等)、包括现在时刻在内的时间状语(如：this morning ／ month ／year...，today等)连用。
例如： Have you found your pen yet？你已找到你的钢笔了吗？
2.现在完成时的"未完成用法"
现在完成时的"未完成用法"指的是动作开始于过去某一时刻，一直延续到现在，或可能还要继续下去。
例如：He has lived here since 1978.自从1978年以来，他一直住在这儿。(动作起始于1978年，一直住到现在，可能还要继续住下去。)
I have been in the army for more than 5 years.我在部队已经呆了五年多了。(动作开始于5年前，一直延续至今，有可能还要继续下去。)
此种用法的句中常需一个表示一段时间的状语(由since或for引导)，或表示与现在时刻相连的时间状语(如：up to now，so far)等。
例如：I have heard nothing from him up to now.到目前为止我没有他的任何消息。
注意：(1)现在完成时的未完成用法只适用于延续性动词，不可用于终止性动词，即瞬间完成或延续时间很短的动词。如：come，go，arrive，leave，join，become，die等。
(2)现在完成时常见两种句型：
①主语＋have / has been＋for短语
②It is＋一段时间＋ since从句
例如：He has been in the League for three years.或It is three years since he joined the League. 他入团已三年了
一.have/has been doing sth.
1.现在完成进行时
当后面接有一段时间的词时,或是加表示时间的词时,可以用现在完成时.如果这件事现在还在持续或还在做,则可用
现在完成进行时.
如:I have been skating for 4 hours.
I have finished my homework.
2.现在完成时的被动语态.
后接动词的过去分词.
如:The building has been built for 5 years.
二.一般现在时:用动词原形
一般过去时:用动词的过去式
一般将来时:will/shall+do
is/am/are going to do
过去将来时:could/would do
现在完成时:have/has done
过去完成时:had done
将来完成时:shall have done
过去将来完成时:would/could have done
现在进行时:is/am/are doing
过去进行时:was/were doing
将来进行时:will/shall be doing
过去将来进行时:would/could be doing
现在完成进行时:have/has been doing
过去完成进行时:had been doing
将来完成进行时:shall have been doing
过去将来完成进行时:would have been doing
2the doctor told[tell]me i have to balance my work用过去时表示这个动作在过去发生的。i

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