蓝梦蝶朵丽卡
1.一般现在时：sometimes,often,usually,always,regularly,generally,everyday,onceaweek,atpresent,nowadays,atthemoment.2.一般过去时：yesterday,lastweek,threedaysago,in19803.一般将来时：begoingto,beto,beaboutto4.过去将来时：should/would+动词原形（should第一人称would第二三人称)5.现在进行时：表示正在进行的词语6．过去进行时：atthattime,then,thistimeyesterday(lastweek),at10o'clocklastnight7.现在完成时：since,forhowlong,today,thisyear(month),lately,recently,sofar,uptonow,till(until),inthepast,during
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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, ever, never, just, yet, till / until, up to now, in past years, always,不确定的时间状语 3）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.
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有的。完成时表示事情已经完成这个状态。有现在完成和过去完成。现在完成时1.表示某个已经发生且对现在造成影响或结果的动作，这种情况常不与任何时间状语连用。I'm sorry I have lost my key. I can't open the door.对不起，我把钥匙弄丢了。门开不了了。（钥匙是什么时候弄丢的，不知道。关键是结果，结果是没有钥匙不能开门。）She has left. If you want to see her, you'll have to come tomorrow.她已经走了。如果你想见她的话，你得明天再来一趟。（她是什么时候走的，不必知道。关键是结果，她人不在此处。）2.表示过去某一时刻发生，且延续到现在的动作或状态，这种情况常与表示一段的时间状语连用。We have lived here since last October.从去年十月份我们就一直住在这儿。She has studied English for 5 years.她学英语已有5年之久。过去完成时1.表示过去某一时刻之前已经完成的动作，常与由by，before引导的时间状语连用。We had learned 5000 words by the end of last month.到上个月底为止我已经学了五千个单词。I had finished the composition before supper.晚饭前我就已经把作文写完了。2.表示过去某一动作之前已经完成的动作，常与由when，before等连词引导的时间状语从句连用。When I woke up it had already stopped raining.我醒来的时候雨就已经停了。3.用于宾语从句或间接引语中I wondered who had taken the umbrella without permission.我想知道谁不经允许就把雨伞拿去。4.某些动词的过去完成时表示一个打算要做却没有做成的事。I had intended to come over to see you last night, but someone called and I couldn't get away.昨晚我本打算来看你，但有人来找，脱不开身。5.用于表示与过去事实相反的虚拟条件从句中If you had come yesterday, you would have met him.如果你昨天来的话，你就已经见到他的面了。
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