新概念二册语法－－－第五课
一般过去时和现在完成时的区别
1 一般过去时 强调过去某一特定时间发生的事情或动作 因此句中常有表示过去某一时刻的时间状语，例如；
last week three days ago this morning in 1998 yesterday just now in the past 等
2 现在完成时 强调过去到现在的动作，或对现在有影响的动作 句中的时间状语一般为
just already yet never ever for since lately recently before up til now so far 等
对比下列句子；
1 I have already seen the film before.
I saw the film last week
2 The train has just left.
The train left just now.
3 He has lived in Beijing since 1998
He lived in Beijing in 1998
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