英语中常见的八种时态回答请按照我的格式回答问题例：1 一般现在时肯定句结构：主语+动词原形/动词的三

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一、 一般现在时
1.概念：经常、反复发生的动作或行为及现在的某种状况.
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,动词上要改为第三人称单数形式）
4.否定形式：am/is/are+not;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.
6.例句：. It seldom snows here.
He is always ready to help others.
Action speaks louder than words..
二、 一般过去时
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：be动词；行为动词 的过去式
4.否定形式：was/were+not;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.
6.例句：She often came to help us in those days.
I didn't know you were so busy.
三、 现在进行时
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, etc. look . listen
3.基本结构：be+doing
4.否定形式：be+not+doing.
5.一般疑问句：把be动词放于句首.
6.例句： How are you feeling today?
He is doing well in his lessons.
四、 过去进行时
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：was/were+doing 4.否定形式：was/were + not + doing. 5.一般疑问句：把was或were放于句首. 6.例句：At that time she was working in a PLA unit. When he came in, I was reading a newspaper.五、 现在完成时 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：have/has + done 4.否定形式：have/has + not +done. 5.一般疑问句：have或has. 6.例句：I've written an article. The countryside has changed a lot in the past few years.六、 过去完成时 1.概念：以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”. 2.时间状语：before, by the end of