謂語(yǔ)動(dòng)詞構(gòu)成：I/we/you/they have worked; he/she/it has worked

(1) 表示過(guò)去某一時(shí)刻發(fā)生，且延續(xù)到現(xiàn)在的動(dòng)作或狀態(tài)，這種情況常與表示一段的時(shí)間狀語(yǔ)連用

We have lived here since last October. 自從去年十月份我們就一直住在這兒。

She has studied English for 5 years. 她學(xué)英語(yǔ)已有5年之久

(2) 表示某個(gè)已經(jīng)發(fā)生且對(duì)現(xiàn)在造成影響或結(jié)果的動(dòng)作，這種情況常不與任何時(shí)間狀語(yǔ)連用

I’m sorry I have lost my key. I can’t open the door.

對(duì)不起，我把鑰匙弄丟了.門開不了了.

She has left. If you want to see her, you’ll have to come tomorrow.

她已經(jīng)走了.如果你想見她的話，你得明天再來(lái)一趟.