hasbeen是什么時態(tài)

　　He has been late on numerous occasions.

　　他已經(jīng)遲到過無數(shù)次了。

　　A peaceable settlement has been reached.

　　已經(jīng)實現(xiàn)和解。

　　The gene for asthma has been identified.

　　哮喘病的基因已被識別。