短暂性动词:The film has begun. 电影已开始了。持续性动词:The film has been on for 45 minutes. 电影已开始45分钟了。再如,Tom has left already. 汤姆已离开了(短暂性动词)Tom has been away for 3 hours.汤姆已离开三小时了。(持续性动词) She has joined the League.她已入团。(短暂性动词)She has been a League member for 2 years.她入团(成为团员)已两年了She has been in the League for 2 years.她入团(成为团员)已两年了。(持续性动词)短暂动词:open, leave, borrow, lend, join, put, close, finish, end等持续动词:be 短语;work, walk, read, keep, run, talk, write,等。