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...

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 ex...

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 ...

现在进行时的定义：现在进行时表示现在或当前一般时间正在进行的动作。可以表示有计划的未来。也是一般现在时表示将来。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。例：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。例：Mr. Green is writing another novel.(说话时并未在写，只处于...

1) 事实状态的动词have, belong, possess, cost, owe, exist, include, contain, matter, weigh, measure, continueI have two brothers.This house belongs to my sister.2) 心理状态的动词Know, realize, think see, believe, su...

1) 概念：表示过去某时正在进行的状态或动作。2) 过去进行时的主要用法是描述一件事发生的背景;一个长动作发生的时候，另一个短动作发生。3) 常用的时间状语this morning, the whole morning, all day yesterday, from nine to ten last evening, when, whileMy brother fell while he was...

1) 概念：表示将来某时进行的状态或动作，或按预测将来会发生的事情。She'll be coming soon.I'll be meeting him sometime in the future.注意：将来进行时不用于表示"意志"，不能说 I'll be having a talk with her.2)常用的时间状语Soon, tomorrow, this evenin...

时间状语从句，条件句中，从句用一般现在时代替将来时When, while, before, after, till, once, as soon as, so long as, by the time, if, in case (that), unless, even if, whether, the moment, the minute, the day, the year, immediate...

1 )"书上说"，"报纸上说"等。The newspaper says that it's going to be cold tomorrow.报纸上说明天会很冷的。2) 叙述往事，使其生动。Napoleon's army now advances and the great battle begins.

1) 有些动词用一般现在时代替完成时：hear, tell, learn, write , understand, forget, know, find , say, remember.I hear (= have heard) he will go to London.I forget (=have forgotten) how old he is.2) 句型It issince代替It has...

1) 表示即将发生的或预定中计划好的活动。Are you staying with us this weekend? 这周和我们一起度周末吗?We are leaving soon.我们马上就走。2) 渐变动词，如：get, run, grow, become, begin及die。He is dying.

1) 如果从句所叙述的为真理或不变的事实，则永远用现在时。At that time, people did not know that the earth moves.He told me last week that he is eighteen.2) 宾语从句中的助动词ought, need, must, dare 时态是不变的。He thought that I need not tell ...

一般现在时every , sometimes, at , on Sunday,一般过去时yesterday, last week, an hour ago, the other day, in 1982, just now一般将来时next, tomorrow, in+时间,现在完成时for, since, so far, ever, never, just, yet, till/until, u...

1)当let后只有一个单音节动词，变被动语态时，可用不带to 的不定式。They let the strange go.--- The strange was let go.2) 若let 后宾补较长时，let 通常不用被动语态，而用allow或permit 代替。The nurse let me go to see my classmate in the hospital.---- I was ...

短语动词是一个整体，不可丢掉后面的介词或副词。This is a photo of the power station that has been set up in my hometown.My sister will be taken care of by Grandma.Such a thing has never been heard of before..