已经一个月了 One month has ; Already for a month ; Already a month ; Now for a month

相遇已经一个月 Met for a month ; Encounter has been a month

已经过去一个月了 It has been a month ; Over a month ; Has in the past month

据说她已走了一个月了 It is said that she has been away for a month

上高中已经一个月了 High already for a month

我已经一个月没见他了 I've seen him a month

暑假已经过去一个月了 Summer is over a month