现在完成时表一个动作已经做完.
和一般现在时比较起来更侧重对现在造成的影响.
一般是. have done sth.
Eg;
Mum,can I go out to play basketball.?I have finished my homework.
妈,我可以出去打篮球了吗.作业已经做完啦.
Eg:
I saw this film yesterday.
我昨天看过这电影.(强调性没那么强.只是单纯的陈述.)
Have you saw the film KINGKONG.?
-I have saw this film yesterday.
我昨天已经看过这电影了.(强调对现在造成的影响.已经看过了.)