一、一般现在时
表示一般状态、习惯动作、客观规律和永恒真理
二、现在进行时
表说话时或目前一段时间内正在进行的活动；或表感情色彩,加强浯气.
三、现在完成时
表目前已完成的动作,强调对现在的影响.时间是算到你说话的时候为止,而且现在完成时有一些标志性的时间状语：
1．for+时间段；I have learned English for ten years．
2．常见的副词：lately；recently,just,up to now,till now,
so far,these days,
in the past few years／months／weeks／days
3．注意：for+时间段；since+时间点
They have lived in Beijing for five years．
They have lived in Beijing since l995．
4．This is the first time that I have watched stars through a telescope．
第几次做某事,后面跟现在完成时.
四、一般过去时
表在过去某个特定时间发生且完成的动作,或过去习惯性动作,不强调对现在的影响,只说明过去.常跟明确的过去时间连用,如：yesterday；last week；in 1945,at that time；once；during the war；before；a few days ago；when,注意：
1、used to+动词原形,表过去经常但现在已不再维持的习惯动作.
He used to smoke．
2、be／become／get used to+动名词doing,表习惯于
He has got used to getting up early．
He used to smoke a lot.
3、They have lived in Beijing for five years．
用现在完成时表示到目前是5年.
He lived in Japan for five years as a middle-school student.
用一般过去时则表示这个时间段和现在无关,只表示他过去在日本住了5年.
五、过去进行时
表示过去某个时间点或某段时间内正在发生的动作.
The boy was doing his homework when his father came back from work．
He was taking a leisurely walk by the lake when he heard someone shouted for help．
六、过去完成时
表示过去某个时间之前已经完成的动作,句中有明显的参照动作或时间,before,after,by,up till
There had been 25 parks in our city up till 2000．
By the end of last term we had finished the book．
They finished earlier than we had expected．
七、一般将来时
表在将来某个时间会发生的动作或情况.
Beijing will host the 29th Olympic Games in 2008．
除此之外一般将来时总是用在一些时间状语从句或条件状浯从句的主句中：
We will begin our class as soon as the teacher comes．
(主句用一般将来时,从句中一定要用一般现在时替代一般将来时.)
在表示对将来的安排时,一般将来时与将来进行时的比较：
一般将来时往往表示一种打算、情愿、愿意做某事,所以一般将来时表达的比较主观,而将来进行时表示将来的安排时是客观的、必
然的,不强调主观愿望,只强调客观的安排
The President will be meeting the foreign delegation at the airport．
will be meeting,将来进行时,是按照以计划一定会发生的事情.
八、将来完成时
表在将来某时刻之前业已完成的事情,用by+将来的时间
by that time,by the end of this year
By the end of next month,he will have traveled 1000 miles on foot．
By the time you reach the station,the train will have left．
九、将来进行时
表将来某个时间正在发生的动作,或按计划一定会发生的事情.
I'll be doing my homework this time tomorrow．
明天这会我正在写作业.
The President will be meeting the foreign delegation at the airport．
十、现在完成进行时
表示从过去延续到现在并还将继续下去或刚刚还在进行的动作：
I have been learning English for some ten years．
我学英语快十年了.(表示我还要学下去)
I have been waiting for you for two hours．
我在这里等你已经两个小时了.(强调刚刚还在等)