it is/has been=

it is/has been= It is/has been + since sb + it is 时间段和it has been时间 区别 it has been a It has always been . It is\has been+时间段+since+一般过去式=时间段+（）+since+一般过去式 it is 3 years since Tom has been abroad Electricity has always been around a__________ it is invisib It is a week since he has been to BeiJing. 翻译 that is just the way it has always been It is said _____ has been translated into French. She has always been busy () it is Sunday.