常见时态的用法一、一般现在时：1.表示习惯性或经常性的动作或状态，常与usually, often, sometimes,确always, seldom, every day (year, morning…)等表示频率的时间状语连用。
He often does his homework in his study.I usually get up at six in the morning.2. 表示客观规律、正确事实或科学真理等。
Knowledge comes only from practice.※Columbus proved that the earth is round.3. 在连词when, while, before, after, until, till, once, if, unless, as soon as, as long as, by the time, in case, even if, the moment/ minute/instant, the day/ year, immediately 等引导的时间（条件、让步）状语从句中，常用一般现在时表将来。
When Bill comes (will come×), ask him to wait for me. We’ll go out for a walk as soon as the rain stops. Even if it rains tomorrow, the sports meeting will take place.4. come, go, arrive, leave, start, begin, return等动词可以用来表示按照计划、安排将要发生、且不轻易改变的动作（有特定的时间状语）。
. The flight takes off at ten o’clock.School begins on September 1st.※Could you tell me when he ____ back?----When he ____ back, I’ll let you know.A. comes; comesB. will come; comesC. will come; will comeD. comes; will come 5．试比较：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动作；第二句now是进行时的标志，表示正在进行的动作。
二、一般过去时：1）表示在确定的过去时间里发生的动作或存在的状态，常与yesterday, in 1998, two years ago, last month, the day before yesterday, the other day, when从句等连用.The Red Army came into being in 1927.A robber broke into the bank and robbed the bank of a lot of money last night.一般过去时还可表示过去发生的一连串动作。
The monkey jumped off the tree, picked up a big stone and threw it at us.2）用于以下固定句型中：It is (high/ about) time that sb. did sth. 早该做... Would/ had rather sb. did sth. 宁愿某人去做…3）wish, wonder, think, hope, know等用过去时，表示的动作都已成为过去，现已不复存在。
Oh, it’s you. I didn’t know you were here too.三、一般将来时：表示将要发生的动作或存在的状态，常与soon, tomorrow ( morning…), next week (year…), some day, from now on, the day after tomorrow, in the future等表将来的时间状语连用。
有几种构成方式：1.Be going to + 动词原形①表示计划、决心，说话前已打算要做的事情。
②说话人根据已有的迹象或经验判断认为将要发生的事情。
I’m going to buy a new car if I have a lot of money. Look! Dark clouds are gathering. It is going to rain.2. shall/will +动词原形①单纯表将来②表说话时才想到的意愿或决心。
Eg: Jack is ill in hospital.---- Oh really? I _____. I_____ to see him.A. didn’t know; will goB. don’t know; am goingC. haven’t known; will goD. didn’t know; am going3. be + to do ①按照计划、安排将要做的事情。
②（上级对下级、父母对子女）下达命令，意思是“应该…”③表命中注定将要发生的事情。
We are to discuss the report next Saturday.You are to finish the work before five this afternoon. The little boy is to become a VIP.4. be about to +动词原形或be on the point of doing 表示即将或正要去做…. 不与tomorrow, next week等具体的时间状语连用，但可和when从句连用。
I am about to do (=am on the point of doing) my homework.5. be + doing 表示按计划安排即将发生的动作，常用于come, go, start, set out, leave, reach, return, move, take off, arrive等Are you staying here till next week?四、过去将来时：would do; was / were going to do; (was /were to do; was /were about to do; was /were doing; was / were on the point of doing) 一般不能单独使用，常用在宾语从句和间接引语之中，表示从过去的角度看，将要发生的行为或存在的状态。
They said that they would call on me sooner or later. Tom asked me if I was going to call on my English teacher.I was on the point of phoning you when your phone arrived.五、现在进行时：be (am , is , are) + doing①表示现在(说话时刻)正在进行或发生的动作；Look! The monkey is climbing the banana tree.②也可表示现阶段正在进行或发生的动作，说话时未必动作正在进行;What are you doing these days?Mr. Green is writing another novel.③一些位移动词可用现在进行时表将来。
He is coming to see you next week. ※进行时与某些副词（always, constantly, continually, forever）连用，可表赞叹或厌恶等情感。
You are always thinking of others.He is constantly changing his mind.六、过去进行时：was /were doing表示过去某个时刻或一段时间正在进行的动作，这一特定的过去时间，除了上下文暗示以外，一般和时间状语连用。
常用的时间状语有：this morning, the whole morning, all day yesterday, from nine to ten last night, at this time yesterday, when, while等。
What were you doing at this time yesterday?I was reading a newspaper when he knocked at the door. You look unhappy. What’s the matter with you? ---- Nothing much. I was missing my parents. Eg: I don’t think Tom saw us; he ____ into space.A. just staredB. was just staringC. has just staredD. had just stared七、现在完成时have / has + done①表示过去发生或已经完成的某一动作对现在造成影响或结果②表示动作或状态过去已经开始，一直持续到现在。
常用的时间状语有：already, never, ever, just, before, lately, yet, recently, so far, up to the present, up till now, in the past/ last few years, since，“for+段时间”等. Have you had your supper yet?---- Yes, I have just had it. (吃过了饭，所以现在不饿)I have lived here in Yiyang since I was born. (动作持续到现在) ◎has been to 去过…（已经回来）My sister has been to the USA once (but she is back now).◎has gone to 去…了（已去未归）My sister has gone to the USA (and she isn’t here now).※当先行词前有最高级或序数词修饰时，定语从句中一般用现在完成时。