表示從過去某時(shí)開始一直延續(xù)到說話時(shí)還在進(jìn)行,或可能還要繼續(xù)下去的動(dòng)作.它通常和“for+段時(shí)間”或“since+點(diǎn)時(shí)間(也可以是從句)”的時(shí)間狀語連用.例如：
I have been waiting for a letter from my parents.我一直在等我父母的來信.
It has been raining for three hours.
雨已經(jīng)下了三個(gè)小時(shí)了.
We have been studying here since 2004.
自從2004年以來,我們一直在這里學(xué)習(xí).
2.表示從過去某時(shí)開始,一直延續(xù)到說話時(shí)刻,可能剛剛結(jié)束的動(dòng)作.例如：
She has been sweeping the street all day.She is too tired.
她一整天都在掃大街.她太累了.
We have been waiting for you for two hours.We don't want to wait any longer.
我們已經(jīng)等你兩個(gè)小時(shí)了.不想再等了.