初中英语八大时态精析时态在英语中占着举足轻重的作用，学好时态，意味着一只脚已经跨入学好英语的大门。所以，同学们一定要重视时态，把每个时态的用法弄清楚，多理解，多思考,并适当运用和巩固。
1一般现在时的用法
1)表示经常性或习惯性的动作，常与表示频度的时间状语连用。 例：every…, sometimes,ofen,always,usually, twice a week, at…, on Sunday等。 I leave home for school at 7 every morning.He watches Tv once a week .2)表示普遍真理，客观存在，科学事实。The earth moves around the sun. Shanghailies in the east ofChina.3)格言或警句。Pride goes before a fall. 骄者必败。注意：此用法如果出现在宾语从句中，即使主句是过去时，从句谓语也要用一般现在时。例：Columbus proved that the earth is round..4)表示现在时刻的状态、能力、个性或爱好。I don"t want so much. Ann Wang writes good English but does not speak well.比较：Now I put the sugar in the cup. I am doing my homework now.第一句用一般现在时，用于操作演示或指导说明的示范性动作，表示言行的瞬间动作。再如：Now watch me, I switch on the current and stand back.第二句中的now是进行时的标志，表示正在进行的动作的客观状况，所以后句用一般现在时。
2一般过去时的用法
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, an hour ago, the other day, in 1982，yesterday morning (afternoon, evening…)，last night (week, month, year…), a moment ago , a week ago, three years ago… just now,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 do sth "到……时间了" "该……了"It is time sb. did sth. "时间已迟了" "早该……了"It is time for you to go to bed. 你该睡觉了。It is time you went to bed. 你早该睡觉了。4) wish, wonder, think, hope等用过去时，作试探性的询问、请求、建议等。I thought you might have some.我以为你想要一些。注意：一般过去时表示的动作或状态都已成为过去，现已不复存在。Christine was an invalid all her life. (含义：她已不在人间。)Mrs. Darby lived inKentuckyfor seven years.(含义：达比太太已不再住在肯塔基州。)
3现在进行时
1） 表示现在(指说话人说话时)正在发生的事情。We are waiting for you.2）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.3）瞬时动词的进行时一定表示将来的含义。瞬时动词：come,go,arrive,leave,finish,end,start,begin等。We are arriving atLondon.持续动词的进行时需要加表示将来的时间状语或有将来的语境时才能表将来。I am travelling next month.4）与always, constantly, forever等词连用，表示反复发生的动作或持续存在的状态，往往带有说话人的主观色彩。You are always changing your mind.
4过去进行时
1）过去进行时主要表示过去某个时刻正在进行的动作，常和表示过去的状语连用。例如：（just）then那时，当时；at this/that time在这/那时yesterday afternoon昨天下午；at nine在九点；last night昨晚；（at）this time yesterday在昨天这个时候但在不少情况下，没有表示时间的状语，这时需要通过上下文来表示。What were you doing at nine last night?昨晚九点的时候，你在做什么？I was watching TV at home yesterday afternoon.我昨天下午正在家里看电视。They were playing football at this time yesterday.昨天这个时候他们在踢足球。2）过去进行时也可以表示过去某一段时间内正在进行的动作。常与those days, the whole morning, from 8:00 to 12:00 last night等时间状语连用。From 1983 to 1998 , he was teaching at Yale .从1983到1998年，他正在耶鲁大学教书。They were building a bridge last winter .去年冬天他们正在造一座桥。3）过去进行时表示过去将要发生的动作。现在进行时可以表示将来的动作，同样，过去进行时也可以表示从过去某时看来将要发生的动作，常用在间接引语中。Lucy arrived inBeijinglast Friday. But she was leaving for Hong Kong the next morning.上周五Lucy到达北京，但第二天早晨就要动身去香港了。She asked him if he was coming back for lunch.她问他午饭是否准备回来吃。4）过去进行时与频度副词always forever，continually，constantly等连用时表示过去经常反复的动作，常常带有埋怨、讨厌、赞扬或喜爱等情绪。My sister was always forgetting things.(表示埋怨)He was always helping others. (表示赞扬)
5一般将来时
1）表示将来某个时间要发生的动作或存在的状态，也表示将来经常或重复发生的动作。时间状语：tomorrow , soon , next Monday , next year , next weekend , this afternoon , this evening……2）will do表示主观意愿做某事。I will see a movie this morning.表示客观的不以人的意志为转移的客观将来。Fish will die without water.表示临时决定。——Mom, where is the newspaper?——Wait a moment. I will get it for you.3) be going to +do表示计划，安排要发生的事。The play is going to be produced next month。表示有迹象要发生的事Look at the dark clouds.There is going to be a storm.
6过去将来时
立足于过去某一时刻，从过去看将来，常用于宾语从句中。
时间状语：the next day(morning, year…),the following month(week…),etc.
He said he would go toBeijingtheI didn"t know if she was going to come。Wang Lei said that she was going to visit her uncle next Saterday。
7现在完成时
1）表示过去发生或已经完成的某一动作对现在造成的影响或结果。标志词：already, yet, just, ever, never, beforeI have finished my homework.我做完家庭作业了。(过去某时开始做，到现在已完成。)2）表示：过去已经开始，持续到现在的动作或状态，并且有可能继续下去。标志词：for, since, since…agoI have studied English for six years.我已经学了六年英语了。(六年前开始学英语，一直学到现在,也可能继续学也可能就此不学了。)3）have/has gone to、have/has been to和have/has been in的区别have/ has gone to去了，在去某地的路上或在某地，人还未回来have/ has been to曾经去过，人已经回来了have/ has been in已经在，常与一段时间连用如：He has been to Shenyang before.他以前曾去过沈阳。He has been inShenyangfor ten years.他在沈阳10年了。Has he gone toShenyang?他去沈阳了吗?4）非延续性动词不能用“现在完成时+表示一段时间的状语”的句型中。这类动词有：come, go, start, leave, die, buy, finish, join, borrow, stop等。但能够用表示持续状态的相应的延续性动词替换句中的非延续性性动词。arrive, come→be here, die→be dead finish, end→be over go out→be outjoin→be in borrow→keep finish/end→be overclose→be closed leave, move→be awayfall asleep→be asleep
8过去完成时
1）以过去某个时间为标准，在此以前发生的动作或行为，或在过去某动作之前完成的行为，即“过去的过去”。 As soon as we got to the station, the train had left. 2）在told, said, knew, heard, thought等动词后的宾语从句。She said (that) she had never been toParis.3)过去完成时的时间状语before, by, until , when, after, once, as soon as。He said that he had learned some English before.By the time he was twelve,Edisonhad began to make a living by himself.Tom was disappointed that most of the guests had left when he arrived at the party.
