have been doing 是現(xiàn)在完成進(jìn)行時(shí),表主動(dòng)
be being done 是現(xiàn)在進(jìn)行時(shí)的被動(dòng)
意思兩樣可以舉一個(gè)例子嗎謝謝i have been skating for three hours 我已經(jīng)溜冰三小時(shí)了（言下之意，我以前溜冰，現(xiàn)在還在溜冰，以后還會(huì)溜下去）因?yàn)槭侵鲃?dòng)，所以主語是人the bridge is being built人們正在建橋 我再造一個(gè)你也許認(rèn)為意思差不多的 peple have been building the bridge 人們還在建橋，（過去建，現(xiàn)在還在建，以后還會(huì)一直建）