动词的时态（2）

3 一般将来时

1)　shall用于第一人称，常被will 所代替。
　　will 在陈述句中用于各人称，在争求意见时常用于第二人称。
　　Which paragraph shall I read first.
　　Will you be at home at seven this evening?

2)　be going to +不定式，表示将来。
　 a. 主语的意图，即将做某事。
　　　What are you going to do tomorrow?
　 b. 计划，安排要发生的事。
　　 The play is going to be produced next month。
　 c. 有迹象要发生的事
　　 Look at the dark clouds, there is going to be a storm.

3)　 be +不定式表将来，按计划或正式安排将发生的事。
　　 We are to discuss the report next Saturday.

4)　be about to +不定式，意为马上做某事。
　　He is about to leave for Beijing.
　 注意：be about to 不能与tomorrow, next week 等表示明确将来时的时间状语连用。

5) be going to / will

用于条件句时， be going to　表将来
　　　　　　　 will　表意愿
　　If you are going to make a journey, you'd better get ready for it as soon as possible.
　　Now if you will take off your clothes, we will fit the new clothes on you in front of the mirror.

6) be to和be going to

　　 be to 表示客观安排或受人指示而做某事。
　　 be going to 表示主观的打算或计划。
　I am to play football tomorrow afternoon.　　 (客观安排)
　I'm going to play football tomorrow afternoon. (主观安排)

** 一般现在时表将来

1）下列动词：come, go, arrive, leave, start, begin, return的一般现在时表将来。这主要用来表示在时间上已确定或安排好的事情。
　　　The train leaves at six tomorrow morning.
　　　When does the bus star? It stars in ten minutes.

2）倒装句，表示动作正在进行，如：
　　　 Here comes the bus. = The bus is coming.
　　　 There goes the bell. = The bell is ringing.

3）在时间或条件句中。
　　　 When Bill comes (不是will come), ask him to wait for me.
　　　 I'll write to you as soon as I arrive there.

4）在动词hope, take care that, make sure that等后。
　　　 I hope they have a nice time next week.
　　　 Make sure that the windows are closed before you leave the room.

5) 用现在进行时表示将来

　 意为："意图"、"打算"、"安排"、常用于人。常用词为 come, go, start, arrive, leave, stay等。
　 I'm leaving tomorrow.
　 Are you staying here till next week?

4 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。

** 区别一般现在时和现在完成时:
一般现在时： 表达的动作不表明动作从何时开始或已进行了多长时间。
　　Helen　and　Tom　are　happily　married.
　　Bruce　listens　to　the　news　every　morning.

现在完成时:
　a.现在完成时所表达的动作正在进行,但句子总是表明动作是什么时候开始的。
　　Helen　and　Tom　have　been　happily　married　since　their　wedding　day　60　years　ago.
　　Bruce　has　listened　to　the　news　all　his　life　without　missing　a　day.

　b.与现在完成时常用的两个词:　For　and　Since
　　For:表示动作持续的时间。如:for　two　minutes/weeks/years；for　several　days/a　long　time/the　past　month　而在一般现在时不能与之连用。
Since:　表示动作从何时开始的.　如:since　6:00/Apr.　23/last　week　/the　accident

** 区别现在进行时和现在完成进行时:
现在进行时：表示一个正在进行的动作,但不表明动作从什么时候开始的。
　　He　is　waiting　over　there.
　　Matthew　is　study　Chinese　in　Beijing.

　现在完成进行时:
　a.现在完成进行时表示一个过去开始的并且现在仍在进行的动作。
　　He　has　been　waiting　over　there　since　2:00.
　　For　the　last　three　months,　Matthew　has　been　studying　Chinese.

　b.现在完成进行时表示一个进行了很长时间并且刚刚完成了的动作。
　　Oh,　there　you　are!　I　have　been　looking　for　you　everywhere.

　c.与现在完成进行时搭配的时间副词:
　　since,　for,　all/week/month/year,　in　the　past　week/few　months/few　years,　recently,　lately

** 现在完成时和现在完成进行时:
　现在完成时：可表明发生动作的具体数字和次数。
　　He　has　tried　to　pass　the　exam　twice.
　　
　现在完成进行时：不表明发生动作的具体数字和次数。
　　He　has　been　trying　to　pass　the　exam　all　month.

**

** 比较一般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, 表示一个过去已经完成的动作。
a. 表示一个过去已经完成的动作。 Last　week　I　went　swimming　with　Tom.
b. 表示在过去一段时间内反复发生的动作,但现在已经结束。与之搭配的时间副词:last　year,　last　weekend,　last　month.　有时用this　weekend,　this　year,
　　I　went　to　Canada　twice　this　year.
　　I　attended　a　wedding　party　this　weekend.
c.表示已完成的过去的一段活动:
　　Our　family　owned　that　house　for　generations.　(We　don't　own　it　now.)

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,
a.表示过去的一个动作但其发生的时间不确切或不知道。常用的时间副词有:ever,　never,　yet,　still,　already,
　　Linda　still　hasn't　finished　her　assignment.
　　Stanley　has　already　gotten　bored　with　the　life　here　in　Toronto.
　　Have　you　ever　gone　to　Paris?
b.表示过去的一个动作或反复发生的动作,其发生的时间仍在持续。常用的时间副词有:this　week/weekend/month/year;　in　the　past　ten　years;　in　my　life;　today
　　I　have　gone　to　the　post　office　twice　today.
　　Eric　has　taken　several　courses　this　year.
c.表示现在仍在进行的动作,已知动作发生的时间和持续的时间。
　　Our　family　has　owned　that　house　for　generations.　(We　own　it　now.)

　 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.

** 用于现在完成时的句型

1）It is the first / second time…. that…结构中的从句部分，用现在完成时。
　 It is the first time that I have visited the city.
　 It was the third time that the boy had been late.

2）This is the… that…结构，that 从句要用现在完成时.
　 This is the best film that I've (ever) seen.
　　　 这是我看过的最好的电影。
　 This is the first time (that) I've heard him sing.　这是我第一次听他唱歌。

典型例题
(1) ---Do you know our town at all?　
　 ---No, this is the first time I ___ here.
A. was　 B. have been　 C. came　 D. am coming
　 答案B. This is the first time 后面所加从句应为现在完成时，故选B。

(2) ---Have you ____ been to our town before?
　 ---No, it's the first time I ___ here.
A. even, come　 B. even, have come　　C. ever, come　 D. ever, have come
　 答案D. ever意为曾经或无论何时，反意词为never，此两词常用于完成时。 This is the largest fish I have ever seen. It is / was the first time +that-clause 的句型中，从句要用完成时。
　 注意：非延续性动词的否定形式可以与表示延续时间的状语连用。即动作不发生的状态是可以持续的。
（错）I have received his letter for a month.
（对）I haven't received his letter for almost a month.

** 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.

** 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.

** 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。

5 过去完成时

1） 概念：表示过去的过去
----|-------|-----|---->其构成是had +过去分词构成。
那时以前　 那时　现在　　　　　　

2） 用法
　a.　在told, said, knew, heard, thought等动词后的宾语从句。
　　 She said (that) she had never been to Paris.
　b. 状语从句
　　 在过去不同时间发生的两个动作中，发生在先，用过去完成时；发生在后，用一般过去时。
　　 When the police arrived, the thieves had run away.
　c. 表示意向的动词，如hope, wish, expect, think, intend, mean, suppose等，用过去完成时表示"原本…，未能…"
　　 We had hoped that you would come, but you didn't.

3)　过去完成时的时间状语before, by, until , when, after, once, as soon as。
　 He said that he had learned some English before.
　 By the time he was twelve, Edison had began to make a living by himself.
　Tom was disappointed that most of the guests had left when he arrived at the party.

典型例题　
　 The students ___ busily when Miss Brown went to get a book she ___ in the office.　
A. had written, left　B，were writing, has left　 C. had written, had left　D. were writing, had left
　 答案D. "把书忘在办公室"发生在"去取书"这一过去的动作之前，因此"忘了书"这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在"同学们正忙于……"这一背景下，when所引导的动作发生。因此
前一句应用过去进行时。

注意：　had no … when　　　　　还没等…… 就……
　　　　had no sooner… than　　刚…… 就……
　 He had no sooner bought the car than he sold it.

**区别一般过去时和过去完成时:
　　二者的区别在于过去完成时表示在过去的过去所发生的动作。
　　Mary　was　hungry　because　she　hadn't　eaten　breakfast.
　　Charlie　lost　his　way　to　the　hotel　although　he　had　been　there　a　few　days　earlier.
　　I　realized　that　I　hadn't　eaten　a　single　French　Fry　since　I　started　my　diet.

** 用一般过去时代替完成时

1)　两个动作如按顺序发生，又不强调先后，或用then，and，but 等连词时，多用一般过去时。
　　 When she saw the mouse，she screamed.
　　 My aunt gave me a hat and I lost it.

2 ) 两个动作相继发生，可用一般过去时；如第一个动作需要若干时间完成，用过去完成时。
　　 When I heard the news, I was very excited.

3)　叙述历史事实，可不用过去完成时，而只用一般过去时。
　　 Our teacher told us that Columbus discovered America in 1492.

6 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.