过去完成时讲解（英语中过去完成时是什么？）

　　过去完成时讲解（英语中过去完成时是什么？）
　　过去完成时(The Past Perfect Tense):表示过去某一时间或动作以前已经发生或完成了的动作，对过去的某一点造成的某种影响或是结果，用来指在另一个过去行动之前就已经完成了的事件。在英语时态中，＂时＂指动作发生的时间，＂态＂指动作的样子和状态。 它表示动作发生的时间是＂过去的过去＂，侧重事情的结果。
　　动词(现在分词)
　　在大多数动词后面加ing。 例如：play > playing, cry > crying, bark > barking
　　对于以e结尾的动词，请去掉e并添加ing。 例如:slide > sliding, ride > riding
　　对于以ie结尾的动词，将ie改为y并添加ing。例如:die > dying, tie > tying
　　如果一个动词的最后一个音节是辅音-元音-辅音的组合，并且要重读，在加上ing之前，把最后一个字母翻倍。beg > begging, begin > beginning. 然而enter > entering 输入(最后一个音节不重读)
　　对于许多非母语人士来说，掌握过去进行时是很困难的，因为许多语言都没有对应的过去进行时。
　　过去进行时描述的是过去某一特定时间正在进行的行为。它可以使用:
　　描述在过去开始并被另一个动作打断的动作:
　　He was writing an e-mail when the phone rang.
　　When the phone rang, he was writing an e-mail.
　　While he was writing an e-mail, the phone rang
　　描述在过去同一时间正在进行的两个动作:
　　I was preparing dinner while Melanie was working upstairs.
　　While Melanie was working upstairs, I was preparing dinner.
　　注意:就像上面的例子一样，句子中的词序可以互换，但是，要记住，我们在过去进行时之前使用时间短语while，在句子的一般过去时之前使用when。在每个句子中只使用其中一种时间表达。
　　过去进行时由was或were和动词的ing(现在分词)形式构成。
　　Subjecta form of be + verbingrest of sentence
　　I / He / She / Itwas finishingthe exam when the bell rang
　　You / We / Theywere payingthe bill while I was waiting to be seated
　　否定句在过去进行时(进行时)
　　拼写提示
　　当要缩短第一人称和第三人称(I, he, she, it)时，只需去掉not中的o，加一个括号(')
　　was not > wasn’t
　　were not > weren’t
　　过去进行时的否定形式是由was not或were not +动词的ing形式(现在分词)构成的。
　　注意:一般情况下，这些缩略词都用否定形式:wasn 't, weren 't。当你想突出重点的时候，保存长格式。
　　Subjecta form of be + verbingrest of sentence
　　I /He / She / Itwasn’t cryingwhen you came home
　　You / We / Theyweren’t hikingthere when the earthquake hit
　　I wasn’t sleeping when you came home last night.
　　When Ms. Foster came in, the girls weren’t studying.
　　Sam wasn’t lying when he said he loved you.
　　过去进行时的是/否疑问句
　　如果要问一个可以用yes或no来回答的问题，可以用Was或Were开头(否定疑问句用Wasn 't或Weren 't)，然后选择主语(做动作的人或物)，接着用动词的ing形式(现在分词形式)，然后是问题的其余部分。
　　A form of Besubjectverbingrest of sentence
　　WasIwalkingtoo fast
　　Washe / she / itshoutingwhile you were trying to sleep
　　Wereyou / we / theywaitingfor her when the plane landed
　　Was I talking to you?
　　Were you writing the report when the electricity went off?
　　When you came home, was he singing in the shower?
　　Wasn’t Tom sitting in the cafe when you drove past?
　　过去进行时的疑问句(进行时)
　　Wh-问题是在答案中需要更多信息的问题。典型的wh-词包括what, where, when, which, why, who, and how。要创造一个wh-疑问句，先从wh-单词开始，然后是was或were(否定疑问句是wasn 't或weren 't)，然后是主语(做动作的人或事物)，然后是动词的ing(分词)形式，直到那时才添加句子的其余部分。
　　Wh Word a form of besubjectverbingrest of sentence
　　WhowasItalkingto
　　Whatwashe / she / itdoing
　　Whenwereyou / we / theyplanningon telling me the bad news
　　Where were you standing when the trouble started?
　　Who was I talking to? I can’t remember.
　　Why wasn’t she waiting at the meeting point?
　　反义疑问句是加在句尾的简短疑问句。它们只是用来确保和你说话的人理解你的意思或强调你说的话。
　　它们由过去进行时的肯定句加上wasn 't或weren 't和一个代词(I, you, we, They, he, she, it)和一个问号组成。
　　I was snoring last night, wasn’t I?
　　They were all rushing for the exit, weren’t they?
　　When Mr. Thomas called, David was solving crossword puzzles, wasn’t he?
　　当你使用否定句时，你也可以添加一个肯定的标签。
　　Jennifer wasn’t trying very hard, was she?
　　The trains weren’t running on schedule yesterday, were they?
　　规则是:当句子是肯定的时候，标签是否定的。
　　当句子是否定的时候，标签是肯定的。
　　练习-过去进行式
　　填写动词过去进行时(进行时)或一般过去时的正确形式，如示例中所示。
　　Tom was wrapping the gift when I walked in the room. (wrap / walk)
　　Did he comfort her while she was crying? (comfort / cry)
　　What were you doing when the accident occurred? (do / occur)
　　What _______the manager ________ at 7:00 pm yesterday? (do)
　　Tina and Shelly ____________ to the hotel when it _________ to rain. (walk/start)
　　When Donny _________ the room, everyone ______________. (enter/talk)
　　I _________ in the sales department when I first _________ Sofie. (work/meet)
　　My brother ______the computer while I ______ for my trip. (use/pack)
　　______ you ______ attention when the teacher ______ your name? (pay/call)
　　We ______ TV when the lighting ________. (watch/ strike)
　　She _______ about me behind my back, wasn’t she? (whisper)
　　______ the client really ______out while Troy ______ the proposal? (walk / present)
　　This morning, while I ________ breakfast, someone _______ on the door. (eat /knock)
　　1.was/doing 2.were walking/started 3.entered/was talking 4.was working/met 5.was using/was packing 6.Were/paying/called 7.were watching/struck 8.was whispering 9.Did/walk/was presenting 10.was eating/knocked