你好!

may have been 可能已经是怎么了
may be可能是怎么了

如,He may have been sad for a year.他可能已经伤心一年了
He may be sad.他可能会伤心

百度教育团队【海纳百川团】为您解答
如满意,请点击“选为满意答案”按钮,谢谢～