it has been two day since we left our hometown为什么用has been如题

it has been two day since we left our hometown为什么用has been如题 He has been here since yesterday.(同义句)He has been here for ___ ___.one day 还是 two days paul has been away form canada since two day ago ____ two days since paul_____ canada.同义句 john____ it for two hours,and he`s still watching now 1.has been 2.watching 3.has been watching There has been plenty of rain these days.It has rained--- --- these day. Has it got two IT has two wheels . it is two years since I came here还是it has been two years since I came here It has been two weeks since I last wrote to you.意思? 为什么It is two months since she left Beijing用is不用has been The picture has been here.It was here two years ago.用since该写句子 it has been two days since I started study.这句子对吗? Is it two weeks since he left London 可以这样改吗He has been to London for two weeks Lucy has been away from home for two years.（改同意句） It's two years since Lucy________. Lucy has been away from home for two years 句型转换 it's two years since Lucy（ ）（） her grandmather has been dead for two years同义句it ___ two years since her grandmather __ My College LifeHow time flies.It has been two years from the day I came to shijiazhuang vocational technology institute.In the two years .many things happened.I also meet a lot of friends here.Two years is not too long for man's life.But the two year The space shuttle has _____the space station.It brought back two astronauts A been B gone C been toDgone to