This ring has been passed on in my family from mother to daughter.这句话为什么用现在完成时?如题

This ring has been passed on in my family from mother to daughter.这句话为什么用现在完成时?如题 This account has been blocked. this file has been damage This IP has been banned Our P.E teacher has been at this school since he came.（划线提问） I know this has been hard.has been 是什么语法? she has not been around this week This username has already been used是什么意思 This domain has been blocked是什么意思 Sorry,this email has been registered. what a week this has been It has been e()hot this week. This game has been Domain locked! Sorry,this loginid has been registered. Sorry, this loginid has been registere是? This Account Has Been Suspended这是什么意思 This account has been cancelled 如题 this video has been removed 求翻译