关于It is /has been +时间 since +过去时 表达两种意思的问题据说一种是表达从做一件事情开始到现在一直持续了一段时间.另一种是说已经有一段时不做什么事情了.好像和since后的动词是否是延

it is/has been= 翻译 that is just the way it has always been it has been a long time. what is up It is/has been + since sb + 具体,简洁. It is/has been+since sb+did 怎么用? Electricity has always been around a__________ it is invisible. It is a week since he has been to BeiJing. it is 3 years since Tom has been abroad It is reported that the British destroyer has been sunk. the payment has been successful,it is mobile website screenshot It has often been said that life is difficult as it isas it is 如何理解 关于it is ...since的问题我知道it is...since时,since后加动词过去时时,is可以改成has been.那么如果it was...since的时候since后面的动词用什么呢?是had been吗?还是这个句型不对?那另一个是什么句子呢?我 有关于现在完成时的~Dick is not here.he__________the cinema.A.has gone B.has been toC.has been away D.has been with It has been three hours since he left his office.把has been 换成is也可以吗 It has been proved that his theory is practical 怎么变为 His theory has been proved ( )如题 it has been since.用法 It has been in my It's has been accepted