延续性与非延续性动词在现在完成时态中的使用：
1. 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、leave、buy、join、die、borrow、become、get up、open、stop等，这些动词虽然可以用于现在完成时，但由于他们不能延续，所以不能跟表示一段的时间状语连用，若要解决这个问题，就需要把其改为相应的延续性动词或短语，主要有以下几种：
A. 变为相应的延续性动词，如：buy—have borrow—keep come/go/become—be
Put on—wear catch a cold—have a cold
B 转化成be+名词，如：join—be a member of go to school—be a student
C 转化成be+形容词或副词，如：die-be dead leave—be away begin—be on finish-be over fall asleep-be asleep open-be open get up-be up close-closed
D. 转化成be+介词短语，如; come to/go to/arrive in(at)/get to/reach—be in(at) join the army--be in the army
Eg: 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 one month.
His grandfather has died. His grandfather has been dead for two years.
My father has arrived in Shanghai. My father has been in Shanghai for one week.
2. 在否定句中，非延续性动词也可以与时间段连用
Eg: I haven’t borrowed books from the library since last year.
Jim hasn’t come back for one year.
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