2.时间状语：always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays,
3.基本结构：动词+ 原形 （如主语为第三人称单数，动词上要加（e）S）
6.例句：. It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
verbs of the senses: hear,see,taste,smell
verbs of the thinking: believe,know,mean,realize,think,remember
verbs of the linking: dislike,fear,hate,like,love,want verbs of the possession: belong,have,own,possess
2.时间状语：ago, yesterday, the day before yesterday, last week(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.
6.例句：She often came to help us in those days.
I didn't know you were so busy. She sang a song of Lin Feng yesterday.
2.时间状语：now, at this time, these days, etc.
6.例句：How are you feeling today?
He is doing well in his lessons.
7. 一般表示位移的词如leave fly arrive go come. 等用现在进行时表将来。
I am flying Beijing next week .表示我下周即将飞往北京。
He is leaving for Beijing tomorrow. 他明天即将去北京。
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。
4.否定形式：was/were + not + doing.
6.例句：At that time she was working in a PLA unit.
When he came in, I was reading a newspaper.
2.时间状语：recently, lately, since…for…,in the past few years, etc.
3.基本结构：have/has + done
4.否定形式：have/has + not +d one.
6.例句：I've written an article.
It has been raining these days.
2.时间状语：before, by the end of last year(term, month…),by the time...,etc.
3.基本结构：had + done.
4.否定形式：had + not + done.
6.例句：As soon as we got to the station, the train had left.
By the end of last month. We had reviewed four books
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：am/is/are/going to + do；will/shall + do.
4.否定形式：am/is/are/+ not+going to; 在行为动词前加will/shall(will适用于所有人称，shall只用于第一人称）
6.例句：They are going to have a competition with us in studies.
It is going to rain. I think he will be back soon
2.时间状语：the next day(morning, year…),the following month(week…),etc.
3.基本结构：was/were/going to + do；would/should + do.
4.否定形式：was/were/not + going to + do;would/should + not + do.
6.例句：He said he would go to Beijing the next day.
I asked who was going there .