3、ek.4.TheyhavelearnedEnglishforsixyears.三、现在完成时和一般过去式的异同点:Eg:1.Iwateredtheflowers.2.Ihavewateredtheflowers.动作发生在过去,和现在无联系。动作发生在过去,和现在有联系(言外之意,你不需要浇花了,我已经浇好了)四、非延续性动词:表示的动作不能延续,即动作发生后立即结束。用法特征:1.非延续性动词可用来表示某一动作完成,因此可用于现在完成时。如:The train has arrived.火车到了。Have you joined the computer group?你加入电脑小组了吗?
4、2.非延续性动词表示的动作极其短暂,不能持续。因此,不可与表示一段时间的状语连用(只限肯定式)。如:他来这儿五天了。误:He has come here for five days.正:He has been here for five days.3、非延续性动词转换为相应的延续性动词若句中出现时间段,则必须使用相应的延续性动词。转换如下:leave→been away,borrow→keep, buy→have,begin/start→be on, die→be dead,move to→live in, finish→be over,join→be in/be a member o
5、f,open sth.→keep sth. open,fall ill→be ill,get up→be up,atch a cold→have a cold。例句:Thefilmbegan5minutesago.Thefilm_________for5minutes.2.Theyleftanhourago.They_________foranhour.3.Iboughtthecartwoyearsago.I______thecarsincetwoyearsago.4.Susanborrowedthebookaweekago.Susan______thebookforaweek.5.T