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动词的时态
used to + do:"过去常常"表示过去习惯性的动作或状态,但如今已不存在。
  Mother used not to be so forgetful.  
  Scarf used to take a walk.  (过去常常散步)
be used to + doing: 对……已感到习惯,或"习惯于",to是介词,后需加名词或动名词。
  He is used to a vegetarian diet.  
  Scarf is used to taking a walk.(现在习惯于散步)
典型例题   
---- Your phone number again? I ___ quite catch it.
(06/10/2006 00:09:18) [查看全文]
1)在确定的过去时间里所发生的动作或存在的状态。
  时间状语有:yesterday, last week, an hour ago, the other day, in 1982等。
  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。
  When I was a child, I often played football in the street.
  Whenever the Browns went during their visit, they were given a warm welcome.     
3)句型:
  It is time for sb. to
(06/10/2006 00:09:18) [查看全文]
现在进行时的基本用法:
 a. 表示现在( 指说话人说话时) 正在发生的事情。
   We are waiting for you.
 b. 习惯进行:表示长期的或重复性的动作,说话时动作未必正在进行。
   Mr. Green is writing another novel. 
   (说话时并未在写,只处于写作的状态。)
   She is learning piano under Mr. Smith.
 c. 表示渐变的动词有:get, grow, become, turn, run, go, begin等。
   The leaves are turning red.
   It's getting warmer and war
(06/10/2006 00:09:14) [查看全文]
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.
(06/10/2006 00:09:13) [查看全文]
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.
(06/10/2006 00:09:13) [查看全文]
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, expe
(06/10/2006 00:09:13) [查看全文]
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.     
(06/10/2006 00:09:13) [查看全文]
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+ sinc
(06/10/2006 00:09:13) [查看全文]
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.
(06/10/2006 00:09:13) [查看全文]
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
(06/10/2006 00:09:13) [查看全文]
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, ev
(06/10/2006 00:09:13) [查看全文]
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。
(06/10/2006 00:09:13) [查看全文]
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?
(06/10/2006 00:09:13) [查看全文]
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 co
(06/10/2006 00:09:13) [查看全文]
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)
(06/10/2006 00:09:13) [查看全文]
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