5、actoryfortenyears.=Myunclehasworkedatthisfactorysincetenyearago.I’ve lived heresince1990.I haven’t seen himforthree years.如:HehastaughtheresincehecametoChina.自从他来到中国就在这儿教书。Wehavebeenfriendssincewemetinschool.我们从在学校见面起就成为了好朋友。(4)since能引导时间状语从句(主句用现在完成时,从句用一般过去时),而for则不能。含有for,since的现在完成时
6、的用法歌诀:过去的动作或状态,一直持续到现在,for、since把时间带。歌诀She’s been at this schoolsincefive years ago.二选用for和since填空:1.Wehaven’tseeneachother______alongtime.2.Hisfatherhasbeeninthefactory______10yearsago.3.Thefilmhasbeenon______20minutes.4.MrGreenhasworkedhere______hecametoChina.5.Hisgrandparentshavebeen