现在完成时的所有知识,特别是短暂性动词与延续性动词,since 能不与短暂性动词连用since表示的是一个动作持续到现在，能与短暂性动词连用吗？表示什么意义？

现在完成时的所有知识,特别是短暂性动词与延续性动词,since 能不与短暂性动词连用since表示的是一个动作持续到现在，能与短暂性动词连用吗？表示什么意义？
现在完成时的所有知识,特别是短暂性动词与延续性动词,since 能不与短暂性动词连用
since表示的是一个动作持续到现在，能与短暂性动词连用吗？表示什么意义？

现在完成时的所有知识,特别是短暂性动词与延续性动词,since 能不与短暂性动词连用since表示的是一个动作持续到现在，能与短暂性动词连用吗？表示什么意义？
1.现在完成时
现在完成时用来表示之前已发生或完成的动作或状 态,其结果的确和现在有联系.动作或状态发生在过去 但它的影响现在还存在；也可表示持续到现在的动作或 状态.其构成： have (has) +过去分词.
2.比较过去时与现在完成时
1）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.
2）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,
不确定的时间状语
3）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.
3. 比较since和for
Since 用来说明动作起始时间,for用来说明动作延续时间长度.
I have lived here for more than twenty years.
I have lived here since I was born..
My aunt has worked in a clinic since 1949.
Some new oilfields have been opened up since 1976.
I have known Xiao Li since she was a little girl.
My brother has been in the Youth League for two years.
I have not heard from my uncle for a long time.
注意：并非有for 作为时间状语的句子都用现在完成时.
I worked here for more than twenty years.
(我现在已不在这里工作.)
I have worked here for many years.
(现在我仍在这里工作.)
小窍门： 当现在完成时+一段时间,这一结构中,我们用下面的公式转化,很容易就能排除非延续动词在完成时中的误使.
1) (对) Tom has studied Russian for three years.
= Tom began to study Russian three years ago, and is still studying it now.
2) (错) Harry has got married for six years.
= Harry began to get married six years ago, and is still getting married now.
显然,第二句不对,它应改为 Harry got married six years ago. 或 Harry has been married for six years.
4. since的四种用法
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six).
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student
5.延续动词与瞬间动词
1) 用于完成时的区别
延续动词表示经验、经历； 瞬间动词表示行为的结 果,不能与表示段的时间状语连用.
He has completed the work. 他已完成了那项工作. (表结果)
I've known him since then. 我从那时起就认识他了.(表经历)
2) 用于till / until从句的差异
延续动词用于肯定句,表示"做……直到……" 瞬间动词用于否定句,表示"到……,才……"
He didn't come back until ten o'clock.
他到10 点才回来.
He slept until ten o'clock.
他一直睡到10点.
典型例题
1. You don't need to describe her. I ___ her several times.
A. had met B. have met C. met D. meet
答案B. 首先本题后句强调对现在的影响,我知道她的模样,你不用描述.再次,several times告知为反复发生的动作,因此用现在完成时.
2.---I'm sorry to keep you waiting.
---Oh, not at all. I ___ here only a few minutes.
A. have been B. had been C. was D. will be
答案A. 等待的动作由过去开始,持续到现在,应用现在完成时
关于since;
since的用法主要有两点：一是表示“自从……以来”,二是表示“既然”之意.但如果只了解词的含义,而不了解其用法,在使用时就会造成错误.例如：I have not heard from him since I lived in Shanghai.
不少人会望文生义,将该句译为：“自从我住在上海以来,就再也没有收到他的信了.”而实际上这个句子的译文并非如此,那么正确的含义是什么呢?
下面谈谈since作连词引导时间状语从句的用法.
一、若since引导的状语从句的谓语动词是终止性的过去时,则从句表示的时间是“从动作开始的那一时刻起”.如：
He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力.
We have been missing them since they left here自从他们离开这里,我们就一直很想念他们.
这是最常见的一种用法,此处不再多述.
二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时,则从句表示的时间是“从那持续动作或状态结束时算起”.如：
I haven’t heard any noise since I slept. Sleep 为持续性动词,sleep的动作结束时,即“醒来”时,这句应译为“我醒后还未听到任何声音”.
John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约,他不当教师已经三年了.
本文开始出现的那个句子就可以译为“自从我离开上海,就再也没有收到他的信.”这种译法常被人们误用,我们不妨再多举几个例子看看：
How long is it since you lived in Shanghai?你离开（没住在）上海多久了?
It is half a month since he was a League member.他退团（不当团员）半个月了.
It’s been quite some time since I was last in London我离开伦敦已很长时间了.
比较：He has written to me frequently since I was ill.自从我病愈以来,他屡次给我写信.（从句谓语为状态动词）
He has written to me frequently since I fell ill.自从我生病以来,他就屡次给我写信.（从句谓语为终止性动词）
三、若since引导的状语从句的谓语为持续性动词的现在完成时,则表示动作和状态延续到现在（说话时刻）,其表示的时间的起点应从动作发生之时算起.如：
I haven’t heard from him since he has lived there.
这里has lived表示动作的持续性,时间的起点应从：“开始居住”时算起.因此此句可理解为“自从他（开始）住在那儿起,我就一直没收到他的来信”.
Since we have owned a car, we have gone camping every year.自从我们自己有了汽车,我们每年都去野营.
试比较：1. Since I’ve been at this school, we have had three headmasters.自从我到这所学校,我们已换了三个校长了.
Since I was at this school, they have had three headmasters.自从我离开这所学校,他们已换了三个校长了.
2.He has never been to see me since I have been ill. 自从我生病以来,他从未来看过我.
He has never been to see me since I was ill. 自从我病愈以来,他从未来看过我.
由此可见,since引导的从句持续动词的一般过去时和现在完成时所表示的意思恰好相反.换言之,前者以肯定的语法形式反映着否定的逻辑内容,而后者的形式与内容是一致的.
至于It is +一段时间+since…的句型与It has been +一段时间+since…意思相同.前者是规范说法,后者是口语说法.
应注意的是,在这种结构中,since引导的从句绝对不能用否定式的谓语动词来表示否定意义,下面两句都错了：
It is a long time since he didn’t study English.
It’s two months since you didn’t come to see me.
正确的说法为：
It’s a long time since he studied English 他好久没学英语了.
You haven’t come to see me for two months. 你有两个月没来看我了.
解析：6B 词义辨析语句连贯尽（as long as）作者所能记忆的.Remember是持续性动词,与表示持续意义的as long as（象……一样长；只要……）连用,引导条件状语从句.as soon as,when,since三项均表示短暂意义,通常与短暂性动词连用.

现在完成时的用法
have(has)+过去分词
1.现在完成时用来表示现在之前已发生活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...

全部展开

现在完成时的用法
have(has)+过去分词
1.现在完成时用来表示现在之前已发生活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
就这些了

收起

MOstly yes,,since- to show when something happens
eg
I've known her since kindy...
my advice is to look up the grammar book...due to the broadness of this question, I am unable to answer it in such a short time..sorry..
I like to only answer specific questions

1。现在完成时用来表示之前已发生或完成的动作或状 态，其结果的确和现在有联系。动作或状态发生在过去 但它的影响现在还存在；也可表示持续到现在的动作或 状态。其构成： have (has) +过去分词。
2。将来完成时
1) 构成will / be going to do sth.
2) 概念
a. 状态完成：表示某事继续到将来某一时为止一直有的状态。

全部展开

1。现在完成时用来表示之前已发生或完成的动作或状 态，其结果的确和现在有联系。动作或状态发生在过去 但它的影响现在还存在；也可表示持续到现在的动作或 状态。其构成： have (has) +过去分词。
2。将来完成时
1) 构成will / be going to do sth.
2) 概念
a. 状态完成：表示某事继续到将来某一时为止一直有的状态。
b. 动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或一获得的经验。
They will have been married for 20 years by then.
You will have reached Shanghai by this time tomorrow.
3。过去进行时的基本用法
a.过去进行时表示过去某一时间正在进行的动作，常和表过去的时间状语连用，如：
I was doing my homework at this time yesterday.昨天的这个时候我正在做作业。
They were expecting you yesterday.他们昨天一直在等待。
b.过去进行时可与soon, the next moment, in minutes, minutes later等时间状语连用，表示一个新的
动作刚刚开始。如：
Soon the whole town was talking about it.不久镇上的人就都谈论起这种事了。
c.过去进行时可用来申述原因或用作借口，这种用法常用在口语中。如：
-- Have you finished your homework, Mary?玛丽，你作业做完了吗？
-- No, I was helping my mother is the kitchen all day yesterday.还没呢，我昨天一天都帮妈妈在厨
房干活。
d.过去进行时可用来为一个后一系列动作的发生提供背景。如：
I hurt my leg when I was riding a bike.我在骑车时把腿摔坏了。
e.过去进行时可表示过去未曾实现的愿望或打算，这时be动词was/were要重读。如：
I was writing him a letter this morning and forgot all about it .我本该今天早上给他写信的
，后来全给忘了。
I was seeing her tomorrow. 我本来打算明天会见她。
He was watching the play yesterday, but he was too busy. 他昨天本来要看那场戏的，可是太忙
了。
过去进行时表示过去某一段时间或某一时刻正在进行的动作。常与之连用的时间状语有，at that
time/moment, (at) this time yesterday (last night/Sunday/week…), at+点钟+yesterday (last
night / Sunday…)，when sb. did sth等时间状语从句。
What were you doing at seven p.m. yesterday?昨天晚上七点你在干什么？
I first met Mary three years ago. She was working at a radio shop at the time.我第一次遇到玛丽
是在三年前，当时她在一家无线电商店工作。
I was cooking when she knocked at the door.她敲门时我正在做饭。
（3）一般过去时往往表示某一动作已经完成，而过去进行时却表示动作在持续或未完成。如：
I saw you while you were speaking to the teacher.你在和老师谈话时我看见了你。
注意：有的过去时间状语既可用于一般过去时，也可用于过去进行时，但含义不同。如：
She wrote a letter to her friend last night.她昨晚给她的朋友写了封信。（信写完了）
She was writing a letter to her friend last night.她昨晚一直在给她的朋友写信。（信不一定写完）
一、过去进行时的时间状语
1.when 和while引导的状语从句中，强调某个动作正在进行的过程中时要用进行时态，while表示一段时
间，因此它所引导的状语从句中，谓语动词常用进行时态，如：
When/While we were having supper, the light went out.我们正在吃饭时灯熄灭了。
2.when用作并列连词时，主句常用进行时态，从句则用一般过去时，表示主句动作发生的过程中，另一个意
想不到的动作发生了。如：
I was walking in the street when someone called me.我正在街上走时突然有人喊我。
二、下面几种情况不用一般过去时而要用过去进行时：
1. 表示过去某一阶段暂时性的习惯动作时。如：
Tom was getting up at six o’clock every day that week.汤姆那一周里每天都是六点钟起床。
2. 与always连用表示赞美，厌烦等感情色彩时。如：
John was always coming to school late.约翰上学总是迟到。
Lei Feng was always doing good deeds for the people.雷锋总是为人民做好事。
3. 用来描写故事发生的情景时。如：
It was a dark night. The wind was blowing hard and the rain was falling heavily. A PLA man
suddenly appeared on the river bank. He wanted to cross the river.那是一个漆黑的夜晚，风刮得很
厉害，雨下得很大，一个解放军战士突然出现在河岸上，他想过河去。
4. when作并列连词，表示“（这时）突然”之意时，第一个并列分句用过去进行时，when引导的并列分句
用一般过去时。如：
I was taking a walk when I met him.我正在散步，突然遇见了他。
We were playing outside when it began to rain.我们正在外边玩，这时下起雨来了。
5go, come, leave, start, arrive等动词可用过去进行时表示过去将来的含义。如：
I was leaving for Wuhan that day.那天我正要去武汉。
She was coming later.她随后就来。
三、过去进行时表示婉转语气（只限于want, hope, wonder 等动词），用以提出请求。如：
I was wondering if you could help me.
I was hoping you could send me home.
4。现在完成进行时
1. 形式：have(has)+been+现在分词，以work为例：
肯定式：
IYouWehave
HeSheIthasbeen working.
否定式：
IYouWehave
HeSheIthasnot been working.
疑问式：
haveIYouWe
HasHeSheItbeen working?
2. 用法
现在完成进行时表示从过去某一时间开始一直延续到现在的动作。现在这个动作可能刚刚终
止，也可能仍在进行。
I have been sitting here all afternoon.
我在这儿坐了一下午了。
How long has it been raining?
雨下了多久了?
They have been fighting for independence since 1960s.
他们从60年代以来一直为独立而斗争。
3?现在完成进行时和现在完成时的区别
1)现在完成进行时一般强调过去发生的动作现在仍在继续。
现在完成时强调过去发生的动作现在已经完成或表示曾经发生过。
I have been writing an article.
我一直在写一篇文章。(仍在)
I have written an article.
这已写好一篇文章。(已完成)
I have been reading that book since last week.
上周以来，我一直在读那本书。(还在读)
I have read that book before.
以前我曾读过那本书。(动作在过去曾经发生过)
2) 现在完成进行时表示刚刚结束的动作，强调动作在不久前持续进行，带有感
情色彩。
现在完成时表示已经结束的动作，强调动作的结果。
Where have you been? We have been looking for you everywhere.
你到哪里去了?我们到处在找你。(表示刚刚结束的动作)
We have looked for him, but haven't found him.
我们找过他，但没有找到他。(表示动作已结束，强调支作的结果)
3) 现在完成进行时表示现在以前的这段时间内反复发生的事情。
All these years they have been contributing articles to our magazine.
这些年来，创立们一直为我们杂志写稿。
We have been seeing quite alot of each other recently.
最近我们常常见面。

收起

由since和for构成的句子或短语是现在完成时的常用状语。现就它们的用法作以下归纳。
一、现在完成时既可以与since引导的时间状语从句连用，又可以与since构成的短语连用。
1. since作连词，后跟句子，它所表示的时间是“从某一点开始”。若从句谓语为终止性动词，主句的时间则从句谓语为终止性动词，主句的时间则从这一“时刻”算起。如：He has lived here...

全部展开

由since和for构成的句子或短语是现在完成时的常用状语。现就它们的用法作以下归纳。
一、现在完成时既可以与since引导的时间状语从句连用，又可以与since构成的短语连用。
1. since作连词，后跟句子，它所表示的时间是“从某一点开始”。若从句谓语为终止性动词，主句的时间则从句谓语为终止性动词，主句的时间则从这一“时刻”算起。如：He has lived here since he lefts Shanghai.
若从为延续性或状态性动词，则从其动作结束“那点”算起。例如：(1) It is six years since he was a teacher. (2) I haven't heard from her since she lived there .
2. since作介词，后跟表示时间的名词，必须是表示“时间的一点”，不能表示时间的一段。例如：
He has taught at this school since 1965.
二、现在完成时与介词for构成的短语连用。
1. 介词for构成的短语，表示时间的长度，后跟一段时间，不能跟时间的一点。例如：
(1) We have studied English for two years.
(2) They have known each other for five years.
2. 终止性动词不能与表示一段时间的介词for连用，但它的否定式可与介词for连用。例如：
3. I have not received his letter for two months.
for He has had the dictionary for two weeks(buy 用 have代替) My father has been in the Party for ten years (join 用 be in)
现在完成时：
表示(1)目前已经完成的动作，或(2)刚刚完成的动作，也可以表示(3)从过去某一刻发生，现在仍然延续着的动作或情况。这个时态强调动作对现在的影响。
The conference has lasted for five days. 会议已经开了五天。
He has just bought an unusual car. 他刚刚买到一辆不一般的小轿车。
当句子中出现表示到现在为止这段时间的状语时，谓语动词一般用现在完成时: 这类状语有：up to now, up till now, so far, these days, this summer, for 后面接一段时间的短语或 since 等:
We haven’t seen each other again since we graduated in 1987. 1987年毕业后我们就一直没见面。
Up till now we have established ten projects. 到目前为止我们共上了十个项目。
So far they have only learned the first three chapters. 到现在为止他们只学了前三章。
We haven’t had much rain this summer. 今年夏天没下多少雨。
一般过去时：
一般过去时表示(1)过去某个特定时间发生，并且一下子就完成了的动作（即：非持续性动作），也可以表示(2)过去习惯性的动作。一般过去时不强调动作对现在的影响，只说明过去。
I had a word with Julia this morning.今天早晨，我跟朱丽亚说了几句话。(1)
He smoked many cigarettes a day until he gave up. 他没有戒烟的那阵子，烟抽得可凶了。(2)
一般过去时常与表示过去的时间状语或从句连用，如：yesterday, last week, in 1993, at that time, once, during the war, before, a few days ago, when 等等。
句子中谓语动词是用一般过去时还是用现在完成时，取决于动作是否对现在有影响。
Have you had your lunch? 你吃过午饭了吗？（意思是说你现在不饿吗？）
Yes, I have. 是的，我已经吃过了。（意思是说已经吃饱了，不想再吃了。）
When did you have it? 你是什么时候吃的？（关心的是吃的动作发生在何时。）
I had it about ten minutes ago. 我是大约十分钟以前吃的。
Used to do something 表示过去常做而现在已经停止了的习惯动作。
I used to work fourteen hours a day. 过去常常一天干十四个小时。

收起

现在进行时的所有知识：
现在进行时是由助动词to be 的现在时 + 现在分词构成：
肯定式 否定式 疑问式
I am working.You are working.He (she) is working.We (you,they) are working. I am not working.You are not working.He (she) is not wo...

全部展开

现在进行时的所有知识：
现在进行时是由助动词to be 的现在时 + 现在分词构成：
肯定式 否定式 疑问式
I am working.You are working.He (she) is working.We (you,they) are working. I am not working.You are not working.He (she) is not working.We (you,they) are not working. Am I working?Are you working?Is he (she) working?Are we (you,they) worki
现在分词的构成，是在动词原形上加—ing, 但是应该注意：
情况 变化 例词
动词以单个e 结尾 去掉e, 加 ing Love _lovingArgue _ arguing
动词以 —ee结尾 直接加 ing Agree_ agreeingSee _ seeing
动词为单音节：以单一元音字母 + 单一辅音字母结尾 辅音字母双写，再加 ing Hit _ hittingRun _runningStop _ stopping
动词为双音节或者多音节：最后一个音节为重读音节，以单一元音字母 + 单一辅音字母结尾 辅音字母双写，再加 ing Be’gin be’ginningAd’mit ad’mitting
以 y 结尾的动词 直接加 ing Carry carryingEnjoy enjoying
现在进行时的功用
1） 表示说话时正在发生或者进行的动作
Please don’t make so much noise, I’m studying.
Let’s get out. It isn’t raining any more.
2) 表示在现在相对较长一段时间内正在进行的动作，但是说话一刻不一定在做的动作
Have you heard about Tom? He is building his own house.
David is teaching English and learning Chinese in Beijing.
这些动作，在说话时并不一定在发生或进行，而是在包括说话的一刹那在内的一段时间内发生、进行的。
3）表示最近的确定的安排
Ann is coming tomorrow.
Oh, is she? What time is she arriving?
At 10:15.
Are you meeting her at the station?
I can’t. I’m working tomorrow morning.
以上句子也可以用be going to (do) 的形式来表示。但是谈论已确定的安排时候，用现在进行时态显得更加自然，除非受到动词的功能的限制。在此，切不可用will, 如：
Alex is getting married next month. 不能用 will get married.
4) 和always 连用表示某种情绪，可能是厌烦也可能是赞扬，如：
Tom is always going away for weekends.
My husband is always doing homework.
有些动词是表示一种状态而不是动作，一般不用于进行时。例如，我们一般不说 I am knowing, 而说 I know. 常见的这类动词有：
want like hate know see hear believe understand seem
think(相信) suppose remember need love realize mean forget prefer have （拥有）belong
To understand is to accept. 理解就是接受
Do you like Beijing?
Do you see the rainbow?
I remember him very well.
I think I understand what he wants.
现在完成时态的用法和相应的陈述句，一般疑问句及简略答语。
（1）现在完成时态的构成：现在完成时是由助动词have/has+过去分词构成的。规则动词的过去
分词形式与一般过去时形式相同。不规则动词的一般过去时形式和过去分词的形式则各不相同。如：
规则动词的变化
a.一般情况下在动词后加ed, 例如：work----worked play----played
b.以e结尾的动词，直接加d, 例如：use----used refuse----refused
c.以辅音字母y结尾的动词,变y为i，加ed, 例如：study----studied hurry----hurried
d.以重读闭音节结尾的动词，先双写结尾的辅音字母，再加ed, 例如：stop----stopped drop----dropped
＊不规则动词见书后不规则动词变化表
(2)现在完成时态的用法及相应的陈述句