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（1）概念：表示经常发生的情况；有规律出现的情况；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/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。eg：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。

（1）概念：过去某个时间里发生的动作或状态；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。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。

（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）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。

（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

（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。

5、过去完成时

（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.

（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。eg：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。eg：When 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…"。eg：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……）

（1）概念：状态完成：表示某事继续到将来某一时为止一直有的状态；动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或获得的经验。

（2）时间状语：by then, by this time tomorrow, etc.

（3）基本结构：主语+will+have done+其它。

（4）否定形式：主语+will+not+have done+其它。

（5）一般疑问句：will放于句首eg：①They will have been married for 20 years by then. 到那时他们就结婚将有20年了。②You will have reached Shanghai by this time tomorrow. 明天此时，你已经到达上海了。

（1）概念：表示将来某一时间正在进行的动作，或者按计划将要发生的事情。

（2）时间状语：soon,tomorrow, this evening, on Sunday, by this time, tomorrow, in two days, tomorrow evening, etc.

（3）基本结构：主语+will+be+going to+do+其它。

（4）否定形式：主语+will+not+be going to+do+其它；主语+would/should+not+do.

（5）一般疑问句：will放于句首。eg：①She'll be coming soon. 她会很快来的。②By this time tomorrow, I'll be lying on the beach. 明天此时，我正躺在海滩上。

（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。