Section A 3Grammar focus – 4cUnit 10 I've had this bike for three years. 表示从过去已经开始持续到现在的动作或状态,可以和表示“从过去某一时刻延续到现在的一时间状语”连用,如“for+时间”、“since+过去时间点”、“since+过去时的从句”、“since+一时间+ago”。且for与since引导的时间状语可以相互转换。Present Perfect Tense现在完成时过去的动作或状态,一直持续到现在,for、since 把时间带。e.g. My uncle has worked at this factory for ten years.= My uncle has worked at this factory since ten year ago. I’ve?lived?here?since?1990. 自从1990年以来我就住在这里。?? I?haven’t?seen?him?for?three?years. 我三年没有看见他了。?? 瞬间动词的肯定式不能和时间连用。但其否定式可以和时间连用。因为,其否定式表示的是一种状态,而状态总是可以延续的。如: I haven’t seen him for a long time. 我很久没见到他了。 He hasn’t come here for some time. 他有时间没来了。 I haven’t heard from her since she left. 自她离开以后,我一直没收到她的来信。 *He has come to Beijing for two years.He has been in Beijing for two years.*He has bought that book for three weeks.He has had that book for three weeks.*He has joined the Army for one and a half years.He has been in the army for one and a half years.It is two years since he came to Beijing. It is three weeks since he bought that book.It is one and a half years since he joined the Army. ××× |