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1、延续性与非延续性动词在现在完成时态中的使用 有一些动词是瞬间动词，也叫非延续性动词，这些动词一发生就结束了，常见的有：come, go, arrive, reach,leave,begin, start, buy, join, die, borrow, get up, become, open, stop等。这些动词虽然可以用于现在完成时（说明某个动作的结果还存在），但由于它们不能延续，因此不能跟表示一段的时间状语连用。e.g. Jim has come back. (正)Jim has come back for a month. (误)come back 的动作不能延续一个月，因此错误。
2、瞬间动词不可以用于有段时间的现在完成时态中，因此，若要解决这一问题，就应把它改为相应的延续性动词或短语，主要有以下几种：用相应的延续性动词如： buyhaveborrowkeepcome/go/becomebeput on wearcatch a coldhave a cold转换成be+ 名词如：joinbe a member ofgo to schoolbe a student转换成be+ 形容词或副词如：diebe deadleavebe awaybeginbe onfinishbe overfall asleep be asleepopenbe openget up be upclos
3、ebe closed转换成 be+ 介词短语如： come to/go to/arrive in (at)/get to/reach be in/atjoin the armye.g.I have borrowed the book.I have kept the book for two days.Jim has joined the band.Jim has been a member of the band for a month.His grandfather has died.His grandfather has been dead for 2 years.My father ha
4、s arrived in China.My father has been in China for a week.be in the army(军队 ) 在否定句中，非延续性动词也可以与时间段连用。e.g.I haven t borrowed books from the library since last year.Jim hasn t come back for a year.吉姆已有一年没回来了。自去年以来我就没有在图书馆借过书。 现在完成时的几种常见的句型转换。现在完成时可以转化成一般过去时，还可以转化成“It is/has been +e.g.Jim has been back for a month.时间段 +since 从句 (用一般过去时 )”等句型。= Jim came back a month ago.= It is/has been a month since Jim came back.= A month has passed since Jim came back.= I borrowed the book two days ago.= It is / has been two days since I borrowed the book.= Two days has passed since I borrowed the book.
