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,动词上要加（e）S） 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、 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,these days,etc.3.基本结构：am/is/are+doing 4.否定形式：am/is/are+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.三、 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：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.5.一般疑问句：have或has.6.例句：I've written an article.It has been raining these days.