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(如主语为第三人称单数，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，如主语为第三人称单数，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 提问，如主语为第三人称单数，则用 does，同时，还原行为动词。
①It seldom snows here. 这里很少下雪。
②He is always ready to help others. 他总是乐于帮助别人。
③Action speaks louder than words. 事实胜雄辩。
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。
eg：
①She often came to help us in those days.那些天她经常来帮助我们。
②I didn't know you were so busy.我不知道你这么忙。
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)
eg：
①They are going to have a competition with us in studies.他们将在学习中与我们竞争。
②It is going to rain.天要下雨了。
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
eg：
①He said he would go to Beijing the next day. 他说他第二天要去北京。
②I asked who was going there. 我问，谁要去那里。
2.时间状语：Now, at this time, days, look, listen, etc.
3.基本结构：主语+be+doing+其它
4.否定形式：主语+be+not+doing+其它
5.一般疑问句：把be动词放于句首。
eg：
①Are you feeling good today?你今天感觉如何?
②He is doing well in his lessons.在课上他表现得很好。
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)
eg：
①At that time she was working in a company. 那段时间她在一家公司工作。
②When he came in, I was reading a newspaper. 他进来时，我正在读报纸。
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
5.一般疑问句：have 或 has 放句首。
eg：
①I've written an article. 我已经写了一篇论文。
②The countryside has changed a lot in the past few years. 在过去的几年，农村发生了巨大的变化。
2.时间状语：before, by the end of last year (term, month), etc.
3.基本结构：had+done.
4.否定形式：had+not+done.
5.一般疑问句：had 放于句首。
6.用法：
(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. 她告诉我她从来没有去过巴黎。
(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。
①When the police arrived, the thieves had run away. 警察到达时，小偷们早就跑了。
(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…"。
①We had hoped that you would come, but you didn't. 那时我们希望你能来，但是你没有来。
②I had hardly opened the door when he hit me. 我刚打开门，他就打了我。
(注意：had hardly… when... 刚......就......)
③He had no sooner bought the car than he sold it. 他刚买了这辆车，转眼又卖了。
(注意：had no sooner…than 刚…… 就……)
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