1. 概念：表示经常发生的情况；有顺序出现的情况；总是发生的；事实真理。
2. 时间状语: always， usually， often， sometimes， every week (day， year， month…)， once a week (day， year， month…)， on sundays (on mondays…)， etc.
3. 基本结构：主语+动词原形（如主语为第三人称复数，动词上要改为第三人称单数形式）
4. 否定形式：主语+am / is / are+not+其他；此时态的谓语动词若为行为动词，则在其前加 don’t，如主语为第三人称复数，则用 doesn’t，同时还原行为动词。
5. 一般疑问句：把 be 动词放于句首；用助动词 do 发问，如主语为第三人称单数，则用 does，同时，还原行为动词。
② he is always ready to help others.
③ action speaks louder than words.
1. 概念：过去某个时间里发生的动作或状况；过去习惯性、经常性的动作、行为。
2. 时间状语：ago, yesterday, the day before yesterday, last week, last (year,night,month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time,etc.
3. 基本结构：主语+动词的过去式或 be 的过去式+名词
4. 否定形式：主语+was / were+not+其他；在行为动词前加didn’t，同时还原行为动词。
5. 一般疑问句：was 或 were 放于句首；用助动词 do 的过去式 did 提问，同时还原行为动词。
① She often came to help us in those days.
② I didn’t know you were so busy.
1. 概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事。
2. 时间状语：Tomorrow, next day (week, month, year…), soon, in a few minutes, by…, the day after tomorrow,etc.
3. 基本结构：主语+am / is / are+going to+do+其它；主语+will / shall+do+其它
4. 否定形式：主语+am / is / are not going to+do；主语+will / shall not do+其它
5. 一般疑问句：be 放于句首；will / shall 提到句首。（首字母大写）
① They are going to have a competition with us in studies.
1. 概念：立足于过去某一时刻，从过去看将来，常用于宾语从句中。
2.时间状语：The next day (morning, year…), the following month (week…), etc.
3. 基本结构：主语+was / were+going to+do+其它；主语+would / should+do+其它
4. 否定形式：主语+was / were+not+going to+do+其它；主语+would/should+not+do.
5. 一般疑问句：was 或 were 放于句首；would / should 提到句首
① He said he would go to Beijing the next day.
② I asked who was going there.
1. 概念：表示现阶段或说话时正在进行的动作及行为。
2. 时间状语：Now, at this time, days, look, listen, etc.
4. 否定形式：主语+be+not+doing+其它
① Are you feeling good today?
② He is doing well in his lessons.
1. 概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作。
2.时间状语：at this time yesterday, at that time 或以 when 引导的谓语动词是一般过去时的时间状语等。
3. 基本结构: 主语+was / were+doing+其它
4. 否定形式：主语+was / were+not+doing+其它
5. 一般疑问句：把 was 或 were 放于句首。（第一个字母大写）
① At that time she was working in a company.
② When he came in, I was reading a newspaper.
1. 概念：过去发生或已经完成的动作对现在造成的影响或结果,或从过去已经开始，持续到现在的动作或状态。
2.时间状语：yet, already, just, never, ever, so far, by now, since+时间点，for+时间段，recently, lately, in the past few years,etc.
3. 基本结构：主语+have / has+过去分词+其它
4. 否定形式：主语+have / has+not+过去分词+其它
① I’ve written an article.
② The countryside has changed a lot in the past few years.
1. 概念：过去发生或者已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。
2.时间状语：before, by the end of last year (term, month), etc.
（1）在told, said, knew, heard, thought等动词后的宾语从句中。
She said (that) she had never been to Paris.
（2）在过去不同时间发生的两个动作中，发生在先，用过去完成时;发生在后，用一般过去时。
When the police arrived, the thieves had run away.
（3）表示意向的动词，如hope, wish, expect, think, intend, mean,suppose等，用过去完成时表示”原本…，未能…”。
① We had hoped that you would come, but you didn’t.
② I had hardly opened the door when he hit me.
（注意：had hardly… when… 刚……就……）
③ He had no sooner bought the car than he sold it.
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