1)过去时表示过去某时发生的动作或单纯叙述过去的事情，强调动作;现在完成时为过去发生的，强调过去的事情对现在的影响，强调的是影响。
2)过去时常与具体的时间状语连用，而现在完成时通常与模糊的时间状语连用，或无时间状语。
yesterday, last week，…ago, in1980, in October, just now, 具体的时间状语
this morning, tonight,this April, now, once，before, already, recently，lately
for, since, so far, ever, never, just, yet,till / until, up to now, in past years, always,
3)现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如live, teach, learn, work, study, know.
过去时常用的非持续性动词有come, go, leave, start, die, finish, become, get married等。
举例：
I saw this film yesterday.
Why did you get up so early?
Who hasn't handed in his paper?
She has returned from Paris.
He has been in the League for three years.
He has been a League member for three years.
He joined the League three years ago.
I have finished my homework now.
---Will somebody go and get Dr. White?
---He's already been sent for.
句子中如有过去时的时间副词(如 yesterday, last, week, in 1960)时，不能使用现在完成时，要用过去时。
(错)Tom has written a letter to his parents last night.
(对)Tom wrote a letter to his parents last night.
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