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用所给单词的适当形式填空1.Trees must __________(prevent) from being cut down.2.They __________(plant) ten thousand trees by last spring.3.The sheep_________-九年级英语

[db:作者]  2020-01-10 00:00:00  零零社区

题文

用所给单词的适当形式填空
1. Trees must __________(prevent) from being cut down.
2. They __________(plant) ten thousand trees by last spring.
3. The sheep __________(tie) to the tree has eaten a lot of grass.
4. I can easily hear combs __________(go) through hair.
5. Great changes __________(take) in our hometown in the last ten years.
题型:填空题  难度:中档

答案

1. be prevented   2. had planted   3. tied   4. going   5. have taken

据专家权威分析,试题“用所给单词的适当形式填空1.Trees must __________(prevent) fr..”主要考查你对  现在完成时,被动语态,分词,过去完成时  等考点的理解。关于这些考点的“档案”如下:

现在完成时被动语态分词过去完成时

考点名称:现在完成时

  • 现在完成时:
    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。
    基本结构:主语+have/has+动词的过去分词
    句式:
    1. 否定句式:现在完成时的否定句式是“haven't (hasn't)+过去分词...”。
    如:I have not seen the movie yet. 我还没看这部电影。
    2. 一般疑问句:Have(Has)+主语+过去分词...? 如:
    —Have you finished the work?你已经做完这项工作了吗?
    —Yes, I have. 是的,我已经做完了。(No, I haven't. 不,我还没有做完。)
    3. 特殊疑问句:特殊疑问词+have(has)+主语+过去分词...?如:
    How many times have you been to the Great Wall?你去过长城几次?
    提示:肯定句中有some, already时,改为否定句或疑问句时通常要分别改为any, yet。如:
    I have already finished my homework. 我已经完成了我的作业。
    → I haven't finished my homework yet. (否定句)
    → Have you finished your homework yet? (一般疑问句)
    现在完成时常见两种句型:
    ①for短语
    ②It is+一段时间+ since从句

  • 现在完成时特点:
    1. 非持续性动词的完成时的肯定式不能与时间段连用,若要用时间段状语,则应换成相应的持续性动词或状态动词。
    例如:
    He has left.
    He has been away for an hour.
    2. have/has been to 表示曾经去过某地,但现在不在那;have/has gone to表示现在已去某地,现在不在这。
    例如:
    He has been to Canada, but now he is working in our company.
    Mr. Li in not at home. He has gone to Shanghai.
    3. 完成时的肯定式常用already,而否定式和疑问式常用yet,但若already用于疑问句时,表示一种出乎意外的惊讶。
    例如:Have you read it already?

  • 现在完成时和一般过去时区别:
    现在完成时和一般过去时都表示在过去完成的动作。
    但现在完成时强调的是这一动作与现在的关系。如对现在产生的结果或影响等,
    而一般过去时只表示动作在过去某一时刻发生,不表示和现在的关系。
    比较:
    I have lost my new book.  我把新书丢了。(现在还未找到)
    I lost my new book yesterday. 我昨天把新书丢了。(昨天丢的,现在找到与否没说明)

    have been(to)与have gone( to)的区别:
    have been(to)表示“去过某地(现在已经回来了)”,可用于各人称;
    have gone(to)表示“去某地了(说话时某人不在当地)”,常用于第三人称,
    前者可与once ,never,several times等连用,后者则不能。
    如:
    They have been to Beijing twice.他们去过北京两次。
    He has gone to Beijing .  他去北京了。

    现在完成时注意事项:
    1.如单纯表示一段时间,或强调一段时间,虽有since一词,也不必用完成时。如:
    It is two years since his father died. =His father has been dead for two years.他父亲去世已有三年了。

    2.终止性动词现在完成时的否定式,已变成一种可以延续的状态,因此可以和表示一段时间的状语连用。如:
    I haven't left here since 1997.自从1997年以来,我一直没有离开过这儿。

    3..现在完成时不能单独与准确时间连用,(如表示过去的时间状语)
    如:yesterday(morning、afternoon),last(morning、afternoon)等,除非与for,since连用.

    4.不能与when连用.

  • 现在完成时的用法:
    1.表示动作发生在过去某个不确定的时间,但对现在留下了某种影响和结果。常被just、already、yet 等副词修饰。如:
    -Have you had lunch yet?    
    -Yes,I have. I've just had it.
    2.表示从过去某一时刻开始一直持续到现在的动作或状态。这个动作可能刚停止,可能仍然在进行。
    常带有for和since等表示一段时间的状语。如:
    He has taught here since 1981
    他自1981年就在这儿教书。(可能还要继续教)
    I have't seen her for four years.
    我有四年没见到她了。
    3.表示说话前发生过一次或多次的动作,现在成为一种经验,一般译为汉语“过”。
    常与twice,ever,never,three times等时间状语。 如:
    I have been to Beijing twice.我去过北京

    4. 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,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 been 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.

    5.现在完成时往往同表示不确定的过去时间状语连用,如:
    already(肯定),yet(否定,疑问),just,before,recently,still,lately,never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?

    6.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?
    7.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: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。
    8.一段时间+has passed+since从句
    主语+have / has been+since短语
    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  
    9. 现在完成时常和短语 "up to now /till now","so far" (意思是从过去某一确定的时间一直延续到现在)连用。  
    Up to/till now he's read many story books. 至今他已读过好多故事书。
    I've been to New York three times so far. 至今我已到纽约去过三次。
    has gone (to),has been (to),has been (in) 的区别
    has gone to:去了没回
    has been to :去过
    has been in:呆了很久

考点名称:被动语态

  • 语态:
    是动词的一种形式,它表示主语和谓语的关系。
    语态有两种:主动语态和被动语态。
    如果主语是动作的执行者,或者是说动作是由主语完成的,要用主动语态;
    如果主语是动作的承受者,或者是说动作不是由主语而是由其他人完成的,则用被动语态。

  • 被动语态的构成:
    被动语态的基本结构:
    主语+be +过去分词(+by+动作的发出者)
    ① 一般现在时:am/is/are+过去分词
    如:Trees are planted every year.
    ② 现在进行时 am/is/are+ being +过去分词
    如:The road is being repaired. 
    ③ 现在完成时 have/has + been +过去分词
    如:The work has been finished.
    ④ 一般过去时 was/were + 过去分词
    如:The story was told by him.
    Many birds were killed last year.
    ⑤过去进行时 was/were+ being + 过去分词
    如: The new house was being painted when I got home.
    ⑥过去完成时 had +been+ 过去分词
    如: He told me that the work had been finished.
    ⑦一般将来时  will +be + 过去分词
    如:The problem will be discussed tomorrow.
    ⑧ 过去将来时 would/should +be +过去分词
    如: He said that the Christmas tree would be put up soon.
    ⑨情态动词的被动语态
    情态动词+ be +过去分词    
    如:The problem must be solved soon.
    Children should be taught to love animals.

  • 被动语态使用注意:
    1. 不及物动词无被动语态。 如:happen, break down, come out......
    What will happen in 100 years.
    The dinosaurs disappeared about 65 million years ago.
    2. 有些动词用主动形式表示被动意义。 如: write, sell, ride.....
    This pen writes well.
    This new book sells well.
    3. 感官动词或使役动词使用省略to的动词不定式,主动语态中不带“to”,但变为被动语态时,须加上“to”。
    例:make somebody do something→somebody+ be +made to do something
    see somebody do something→somebody +be +seen to do something
    A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.
    The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
    4. 如果是接双宾语的动词改为被动语态时,直接宾语(物)作主语,那么动词后要用介词,这个介词是由与其搭配的动词决定。
    He gave me a book.→A book was given to me by him.
    He showed me a ticket.→A ticket was shown to me by him.
    My father bought me a new bike. →A new bike was bought for me by my father.
    5. 一些动词短语用于被动语态时,动词短语应当看作一个整体,而不能丢掉其中的介词或副词。
    We can’t laugh at him. →He can’t be laughed at by us.
    He listens to the radio every day. →The radio is listened to by him every day.
    The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse.
    构成be+done.

  • 主动句变为被动句所遵循的4个步骤:
    ①把原主动句中的宾语变为被动句的主语
    ②把动词变为被动形式即be +过去分词,并注意其人称和数随主语的变化,而动词的时态则保持不变。
    ③原主动句的主语如需要则放在by后面以它的宾格形式出现(注代词的宾格),如不需要则可省略。
    ④其它的成分(定语、状语)不变。

    不用于被动语态的情形:
    ①不及物动词没有被动语态
    这类动词有take place, happen, come about, break out, appear, disappear, last,  arise等。
    例如:A fire broke out during the night.
    ②某些静态动词不用于被动语态
    这类动词有have, lack, fit, hold, suit, resemble等。 
    例如:My shoes do not fit me.
    ③宾语为相互代词和反身代词时不用于被动语态
    例如:We should help each other.

    关于主动形式表示被动意义:
    ①系动词(如look, sound, smell, feel, taste, prove等)要用主动表被动,因为系动词为不及物动词,它们没有被动语态形式。
    例如:The building looks very beautiful.
    ②当open, close, shut, lock, move, read, wash, clean, cook, cut, wear, carry 等用作不及物动词且表示主语的某种属性时,通常用主动形式表示被动意义。
    例如:The book sells well.
    ③有的动词本身含有被动意味,通常用主动形式来表示被动含义。
    例如:Her eyes filled with tears.
    ④不定式to blame, to let用作表语时,通常要用主动表被动。
    例如:Who is to blame?
    ⑤某些“be+形容词+to do”结构中的不定式通常要用主动形式表示被动意义。
    例如:The book is difficult to understand.
    ⑥不定式用于某些动词(如have, have got, get, want, need等)的宾语后作定语时,如果不定式的逻辑主语就是句子的主语,通常用主动形式表示被动意义。
    例如:Do you have time to help us?
    ⑦在too...to do sth.和...enough to do sth. 这两个结构中,若主语与其后不定式为to do sth.被动关系,则该不定式通常用主动形式表示被动意义(有时也可直接用 被动式)。
    例如:The writing is too faint to read.
    ⑧be worth后的动名词要用主动表被动。
    例如:This movie is worth seeing.
    ⑨在need, want, require等少数表示“需要”的动词后的动名词用主动形式表示被动意义。
    例如:The house needs cleaning.

    表示“据说”的三类被动句型:
    ①It is said that...句式
    例如:It is said that thirteen is an unlucky number.
    ②There is said that...句式 
    例如:There is said to be plenty of oil off our coast.
    ③sb./sth.is said that...句式
    例如:Mr. Brown is said to have died of liver cancer.

  • 被动语态各时态构成 :

    时态

    被动语态 

    一般现在时

    am/is/are+过去分词

    一般过去时

    was/were+过去分词

    现在进行时

    am/is/are being+过去分词

    过去进行时

    was/were being+过去分词

    一般将来时

    will be+过去分词

    过去将来时

    would be+过去分词

    现在完成时

    have/has been+过去分词

    过去完成时

    had been+过去分词

    情态动词

    情态动词be+过去分词

  • 情态动词的被动语态:
    一、理解含情态动词的被动语态的概念含情态动词的被动语态说明某个被动性动作所反映出的感情和态度。
    初中阶段可用于被动语态的情态动词有“can、may、must、need、should”等,
    分别表示“能够被……”,“可以被……”,“必须被……”,“需要被……“,应该被……”等。

    二、掌握含情态动词的被动语态的不同句式的变换方法含情态动词的被动语态的疑问句、否定句的变化均借助于情态动词完成。
    (一)一般疑问句直接将陈述句被动语态中的情态动词提前。如:
    Mustthisworkbedoneatonce?这项工作必须立即完成吗?
    Shouldyourhomeworkbefinishedbeforesix?你的家庭作业应在六点前完成吗?
    (二)特殊疑问句由疑问词加上一般疑问句被动语态构成。如:
    Whenmustthisworkbedone?这工作必须在什么时候完成?
    Wherecanthelostbookbefound?这本失踪的书能在什么地方被找到?
    (三)反意疑问句借助情态动词构成附加疑问部分。如:
    Thisbridgecanbebuiltnextyear,can'tit?这座桥明年能建成,是吗?
    Thisbookshouldn'tbetakenoutofthelibrary,shouldit?这本书不应被带出图书馆,是吗?
    (四)否定句在情态动词后面加上“not”或“never”即可,但“must”表“必要”时否定式为“needn't”。如:
    Thisworkneedn'tbedoneatonce.这项工作没必要立即做。Thisdustbinshouldn'tbeputhere.这个垃圾箱不应放在这儿。

    三、含情态动词的被动语态的一般疑问句的回答含情态动词的被动语态的一般疑问句的回答应保留原情态动词,
    但“must”表“必须”时,其否定回答应用“needn't”、“need”表“必要”时,其肯定回答应用“must”。如:
    —Shouldmyexercisesbefinishedtoday?我的作业应在今天完成吗?
    —Yes,theyshould.是的,应在今天完成。(No,theyshouldn't.不,不应在今天完成。)
    —Musthisexercisebookbehandedinatonce?他的练习本必须立即上交吗?
    —Yes,itmust.是的,必须立即上交。(No,itneedn't.不,不必立即上交。)
    —Needhebeoperatedonatonce?他必须立即手术吗?
    —Yes,hemust.是的,他必须。(No,heneedn't.不,他不必。)

考点名称:分词

  • 分词:
    就是具有动词及形容词二者特征的词;尤指以-ing或-ed,-d,-t,-en或-n结尾的英语动词性形容词,具有形容词功能,同时又表现各种动词性特点,
    如时态,语态、带状语性修饰语的性能及带宾语的性能。
    分词分为现在分词和过去分词两种,是一种非谓语动词形式。
    现在分词和过去分词主要差别在于:
    现在分词表示"主动和进行",过去分词表示"被动和完成"(不及物动词的过去分词不表示被动,只表示完成)。
    分词可以有自己的状语、宾语或逻辑主语等。

  • 现在分词构成形式:
    ①一般在动词原形末尾加ing,如do→doing、sing→singing、comfort→comforting
    ②以不发音的e、ue结尾的动词,先去e,再加ing,如dance→dancing、hike→hiking、write→writing、make→ making,take→taking
    ③以ee、oe、ye结尾的动词加ing,如see→seeing、toe→toeing、dye→dyeing
    ④以重读闭音节结尾的动词,并且末尾只有一个辅音字母,应双写这一字母,再加ing,如cut→cutting、swim→swimming
    注:结尾是x则不必双写,如relax→relaxing
    ⑤以ie结尾的动词,要把ie变成y再加ing,如die→dying,lie→lying.
    ⑥以ic结尾的动词,要把ic变成ick再加ing,如picnic→picnicking,traffic→trafficking

    过去分词构成形式:
    1.规则动词:规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。四点变化规则:
    (1)、一般动词,在词尾直接加“ ed ”。(然而要注意的是,过去分词并不是过去式)
    work---worked---worked ,  visit---visited---visited
    (2)、以不发音的“ e ” 结尾的动词,只在词尾加“ d ”。
    live---lived---lived
    (3)、以“辅音字母 + y ”结尾的动词,将 "y" 变为 "i" ,再加“ ed ”。
    study---studied---studied,cry---cried---cried,try---tried---tried,fry---fried---fried.[1]
    (4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加“ ed ”。
    stop---stopped---stopped  ,  drop---dropped--dropped
    (5)、以ic结尾的动词,要把ic变成ick再加ed,
    picnic→picnicked  ,traffic→trafficked
    2 、不规则动词:见不规则动词表

  • 分词用法:
    1、分词作状语   
    分词在句子中作状语,可以表示时间、条件、原因、结果、让步、伴随等。   
    分词(短语)作状语时,其逻辑主语应与句中主语相一致。
    当现在分词表示的动作发 生在谓语动词之前时, 则用现在分词的完成式,且所表示动作与谓语动作同时发生, 则用现在分词的一般式。
    完成或被动关系用过去分词。   
    ①现在分词:
    The students went out of the classroom, laughing and talking.   
    ②过去分词:
    Accompanied by his friend, he went to the railway station. 
    Given   better attention, the plants could grow better.   

    2、“while ( when, once, until, if , though等连词)+分词”结构   
    现在分词或过去分词作状语时,有时可以在分词前加while,when, once, although, until, if等连词。   
    ①现在分词:
    When leaving the airport, she waved again and again to us.
    While waiting for  the train, I had a long talk with my sister about her work……   
    ②过去分词:
    Once recovered, he threw himself into his work and made every effort to do it  well.   
    Although working very hard, he failed to pass the final exam. If translated word by word, the passage will be difficult to understand.   

    3、分词作定语   
    分词作定语时,单个的分词通常放在被修饰的名词之前,分词短语一般置于所修饰的中心词后面。
    现在分词修饰的是发出该动作的名词(即与名词有主谓关系),过去分词修饰承受该动作的名词(即与名词是动宾关系)。    
    We will go on with our experiment as soon as we get the added fund.    
    This is really an exhausting day to all of us!   
    We can see the part of the moon lighted by sunlight.   
    After a night spent in excitement and sleeplessness, I forced myself to take a long walk along the beach the next day.   
    More and more developing countries established strategic partnership with  developed countries   

    4、分词作宾语补足语   
    现在分词在see, watch, hear, observe, notice, feel, find, glimpse, glance等感官动词和look at, listen to等短语动词以及
    have, keep, get, catch, leave, set, start, send等使役动词后面与名词或代词构成复合宾语,作宾语补语的成分。
    例:I see him passing my house every day.
    I caught him stealing things in that shop.
    I smelt something burning.

    5、分词作表语
    分词作表语通常看作形容词来用。
    过去分词表示主语的感受或状态,主语多为人。现在分词表示主语的性质,而且主语多为物;
    ①过去分词:
    We were so bored that we couldn’t help yawning.
    She felt confused, and even frightened.
    ②现在分词:
    He was very amusing.
    That book was rather boring.
    很多动词的现在分词都可以作表语:
    exciting, interesting, encouraging, disappointing, confusing, touching, puzzling.

考点名称:过去完成时

  • 过去完成时:
    是把时间推移到过去某一时间之前,与现在不发生联系,由"had+-ed分词"构成。

  • 基本结构:
    主语+had+过去分词vpp.(done)
    ①肯定句:主语+had+过去分词+其他.
    ②否定句:主语+had+not+过去分词+其他.
    ③一般疑问句:Had+主语+过去分词+其他?
    肯定回答:Yes,主语+had
    否定回答:No,主语+hadn't
    ④特殊疑问句:特殊疑问词或词组+一般疑问句(Had+主语+过去分词+其他)?
    ⑤被动语态:主语+had(hadn't)+been+过去分词+其他

    过去完成时基本用法:
    (1)表示在过去某一时刻或动作以前完成了的动作,即“过去的过去”。
    可以用by, before等介词短语或一个时间状语从句来表示,也可以用一个表示过去的动作来表示,还可能通过上下文来表示。
    By nine o’clock last night, we had got 200 pictures from the spaceship.到昨晚9点钟,我们已经收到200 张飞船发来的图片。
    (2)表示由过去的某一时刻开始,一直延续到过去另一时间的动作或状态,常和for, since构成的时间状语连用。
    He said he had worked in that factory since 1949.他说自从1949年以来他就在那家工厂工作。
    (3)叙述过去发生的事情,在已叙述了过去发生的事情后,反过来追述或补述以前发生的动作时,常使用过去完成时。
    I didn’t know a thing about the verbs, for I had not studied my lesson.我对动词一无所知,因为我没有好好学习功课。
    (4)在含有定语从句的主从复合句中,如果叙述的是过去的事,先发生的动作常用过去完成时
    She found the key that she had lost.她丢失的钥匙找到了。
    (5)过去完成时常常用在宾语从句(或间接引语)中,这时从句中的动作发生在主句表示的过去的动作之前。
    I thought I had sent the letter a week before. 我认为我一星期前就把信寄出去了。
    (6)在包含有when, until等连词的复合句中,如果主句谓语动词和从句谓语动词所表示的过去动作不是同时发生的,
    那么先发生的动作通常用过去完成时表示。
    She didn’t go to bed until she had finished he work.她直到把工作做完之后才睡觉。
    注意:如果两个动作紧接着发生,则常常不用过去完成时,特别是在包含before和after的复合句中,因为这时从句的动作和主句的动作发生的先后顺序已经非常明确,这时可以用一般过去时代替过去完成时。
    (7)动词think, want, hope, mean, plan, intend等用过去完成时来表示过去未曾实现的想法,希望,打算或意图等。
    We had hoped to be able to come and see you .我们本来希望能来看看你。
    (8)过去完成时还可用在hardly…when…, no sooner…than…, It was the first (second, etc) time (that)…等固定句型中。
    It was the third time that he had been out of work that year.这是他那一年第三次失业了。

  • 过去完成时与现在完成时的区别:
    现在完成时表示的动作发生在过去,但侧重对现在产生的结果或造成的影响,与现在有关,其结构为“助动词 have (has) + 过去分词”;
    过去完成时则是一个相对的时态,它所表示的动作不仅发生在过去,更强调“过去的过去”,只有和过去某时或某动作相比较时,才用到它。
    比较:I have learned 1000 English words so far.到目前为止我已经学会了 1000 个英语单词。
    I had learned 1000 English words till then.到那时为止我已经学会了 1000 个英语单词。
    — I'm sorry to keep you waiting. 对不起,让你久等了。
    — Oh, not at all. I have been here only a few minutes.没什么,我只等了几分钟。(“等”的动作从过去某一时间点持续到现在)

    过去完成时与一般过去时的区别:
    虽然这两种时态都表示过去发生的动作或存在的状态,但在使用时应注意以下几点:
    1. 时间状语不同:过去完成时在时间上强调“过去的过去”;而一般过去时只强调过去某一特定的时间。
    比较:They had arrived at the station by ten yesterday.
    They arrived at the station at ten yesterday.
    2. 在没有明确的过去时间状语作标志时,谓语动词动作发生的时间先后须依据上下文来判断:先发生的用过去完成时,后发生的则用一般过去时。
    She was very happy. Her whole family were pleased with her, too. She had just won the first in the composition competition.
    3. 当两个或两个以上接连发生的动作用 and 或 but 连接时,按时间顺序,只需用一般过去时来代替过去完成时;另外,在 before , after , as soon as 引导的从句中,由于这些连词本身已经表示出时间的先后,因此也可以用过去时来代替过去完成时。
    He entered the room, turned on the light and read an evening paper.

  • 语法判定:
    一、由时间状语来判定
    一般说来,各种时态都有特定的时间状语。与过去完成时连用的时间状语有:
    (1) by + 过去的时间点。如:
    I had finished reading the novel by nine o'clock last night.
    (2) by the end of + 过去的时间点。如:
    We had learned over two thousand English words by the end of last term.
    (3) before + 过去的时间点。如:
    They had planted six hundred trees before last Wednesday.

    二、由“过去的过去”来判定
    过去完成时表示“过去的过去”,是指过去某一动作之前已经发生或完成的动作,即动作有先后关系,动作在前的用过去完成时,在后的用一般过去时。这种用法常出现在:
    (1)宾语从句中
    当宾语从句的主句为一般过去时,且从句的动作先于主句的动作时,从句要用过去完成时。在told, said, knew, heard, thought等动词后的宾语从句。如:
    She said that she had seen the film before.
    (2)状语从句中
    在时间、条件、原因、方式等状语从句中,主、从句的动作发生有先后关系,动作在前的,要用过去完成时,动作在后的要用一般过去时。如:
    After he had finished his homework, he went to bed.
    注意: before, after 引导的时间状语从句中,由于 before 和 after 本身已表达了动作的先后关系,若主、从句表示的动作紧密相连,则主、从句都用一般过去时。如:
    After he closed the door, he left the classroom.
    (3)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.



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