职称英语考试语法讲解：句型中的语法分析
一般现在时与现在完成时
(1)I come from Shanghai．(上海人)
I have come from Shanghai．(从上海来)
(2)You read very well．(强调能力)
You’ve read very well．(强调一次刚完成的动作) 外语学习网
(3) I forget．(一时想不起来了)
I have forgotten．(仍没想起来，可能已回忆起来了)
(4) The book is written in simple English．(表状态)
The book has been written in simple English．(表动态，已用英语写成)
(5) Every time I see him，he’s been reading．(两个动作不可能同时进行)．
Every time l have seen him，he’s been reading．(强调两个动作同时进行)
(6) He is gone．(强调状态)He has gone．(强调动作和时间)
(7) He won’t come till the play begins．(演出开始时)
He won’t come till the play has begun．(戏已开始)
(8)AfterI leave school，I’11 go to college．(两个动作紧密相接)
After l have left school，I’ll go to college．(强调毕业后，两个动作可能有间隔)
(9) It is a long time since I saw you last．
It’s been a long time since Isaw you last 这两句话一样，后一句是美国英语)
(10) Where are you?(在哪儿) Where have you been?(去了哪儿)
