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3) 表示过去已经开始, 持续到现在, 也许还会继续下去的动作或状态，常与包括现在在内的一段时间的状语连用。
He has studied English for 6 years.
Mary has been busy since she came back from Hangzhou..
过去分词的规则变化：
1.直接加-ed。如：play-played
2.以字母e结尾的直接加d 。如：name-named
3.以辅音字母加y结尾的，变y为i加ed。如：carry-carried
4.重读闭音节且末尾只有一个辅音字母，双写这个辅音字母再加-ed。如：stop-stopped
不规则变化
am/is-was-been are-were-been
begin-began-begun break-broke-broken
do-did-done draw-drew-drawn
drink-drank-drunk drive-drove-driven
eat-ate-eaten fall-fell-fallen
fly-flew-flown forget-forgot-forgotten
give-gave-given go-went-gone
grow-grew-grown hide-hid-hidden
know-knew-known lie-lay-lain
ride-rode-ridden ring-rang-rung
show-showed-shown see-saw-seen
sing-sang-sung speak-spoke-spoken
take-took-taken come-came-come
run- ran – run become-became-become
I have eaten my lunch.
She has eaten her lunch.
He has eaten his lunch.
肯定句
They have eaten their lunch.
现在完成时句型：
I have not (haven’t) seen the film.