时态概念：不同时间发生的动作或存在的状态，用不同的动词形式表示，
称为时态。
一、一般现在时: 表示现在经常发生的或习惯性的动作，及客观现实和普遍真理。 结构: 肯定句 主语+be (am, is, are ) + 其他 eg: I am Chinese. 否定句 主语+be not +其他 eg: I am not a boy. 疑问句 Be+主语+其他 eg: Are you a girl?
或: 肯定句 主语+动原+其他(三单作主语动词要变形) eg: I (He) often get (gets) up early. 否定句 主语+don't+动原+其他(三单作主语don't变doesn't) eg: I (She) don’t (doesn’t) like him. 疑问句 DO+主语+动原+其他(三单作主语do变does ) eg: Do you like playing baseball? Does she like playing football ? The sun rises in the eat . 关键词: sometimes有时，often经常, usually通常，always总 是 ，everyday每天， on Sunday afternoon在周日下午, five days a week 一周五天，three times a month一个月三次…
二、现在进行时: 表示现在 此时此刻 正在发生的动作 结构: 肯定句 主语+be+动词的现在分词(ing)+其他 eg: I am reading now. 否定句 主语+be not+动词的现在分词(ing)+其他 eg: I am not working. 疑问句 Be +主语+动词的现在分词+其他 eg: Are you sleeping? 关键词：now现在 , at the moment此刻 ，look, listen, keep quiet等提示语。
三、一般将来时: 表示将来某个时间，将要发生的动作。 结构: 肯定句 主语+will+动词原型+其他 eg: I will call you later. 否定句 主语+will not +动词原型+其他 eg: I will not go to the park.
疑问句 Will +主语+动词原型+其他 Will you go shopping with her? (will 可改为be going to ,当主语是第一人称时will可用shall)
关键词：tomorrow, next year明年, tonight今晚， this year今年, at the end of this term这学期 期末， from now on从现在开始， soon一会儿马上， later后稍后， in three days 三天之内， in the future未来…
四、一般过去时: 表示过去某个时间，发生的动作。
句子结构：肯定句 主语+be(was,were)+其他eg: I was born on July.1st, 2000. 否定句 主语+be not+其他 eg: I was not born in 1999. 疑问句 Be+主语+其他eg: Were you born in January? 或: 肯定句 主语+动词的过去式(ed)+其他 Lily went shopping yesterday. 否定句 主语 +did not+动 原 +其他 eg: He did not go to school today. 疑问句 Did+主语+动原+其他 eg:Did she pass the test? 关键词： yesterday昨天，last week上周，last year去年, 一段时间+ago 如ten years ago 十年前
five hours ago五小时, in +年/月，on+具体日期... Just now=a moment ago刚才,
五、过去进行时:表示过去某一时刻或某阶段时间，正在发生的动作 结构: 肯定句 主语+was/were+动词的现在分词+其他
eg: I was doing my homework at 8 o’clock yesterday evening. 否定句 主语+was/were not +动词的现在分词+其他
They were not staying at home at this moment last Sunday. 疑问句 Was/Were + 主语+ 动词的现在分词+其他
Were you sleeping when I called you last night?
关键词:具体时间如:at ten o'clock yesterday morning, at this moment last Sunday上周日的这个时候...
六、现在完成时:表示过去发生的动作对现在造成的影响。或过去发生的动作一直持续到现在。
结构: 肯定句 主语+have/has+动词的过去分词+其他(三单变成has)
eg: This year alone, we've already planted ten thousand trees 否定句 主语+have/has not+动词的过去分词+其他
eg: He has not arrived at home yet. 疑问句 Have/Has +主语+动词的过去分词+其他 eg: Have you been to China?
关键词: already 已 经 ， yet 还，just刚刚,，ever曾经, never从不, so far 目前, for + 一段时间, since+过去的具体时间，this year alone今年以来, these five years alone 这五年以来 in the last ten years 在过去的十年中…
七、过去将来时: 从过去的某个时间点看，将要发生的动作或状态。 结构: 肯定句 主语+ would+动原+其他 eg: I didn't know if he would come. 否定句 主语+would not+动原+其他
eg: They were not going to go hiking unless they finished their homework. 疑问句 Would+主语+动词原型+其他 (would you like是词组 一个固定搭配 一般用表示礼貌的问)
eg: Would you like to have a dinner with me?
(would可改为was/were going to ,主语第一人称时would也可以用should) 八、过去完成时: 表示在过去某一时间之前已经完成的动作或状态，强调“过去的过去”
结构: 肯定句 主语+had +动词的过去分词+其他 eg: Mr. Smith died yesterday. He had been a good friend of mine. 否定句 主语+had not +动词的过去分词+其他 eg: He said he has not been to America. 疑问句Had+主语+动词的过去分词+其他
eg: Had he completed his homework by the time you got there. 关键词: by the time, by the end of ，，before , by 等引导时间的状语连用。
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