
现在完成进行时 (present perfect continuous) 强调一个动作从过去持续到现在,常常仍在进行。
结构: 主语 + have / has + been + 动词-ing
我I (完成时)have (进行)been 等待waiting (持续)for 一an 小时hour.
我已经等了一个小时了。(可能还在等)
(天气it)It (完成时)has (进行)been 下雨raining 整all 天day.
雨已经下了一整天了。
注意 否定:haven't / hasn't been + V-ing。疑问:Have / Has + 主语 + been + V-ing?