将瞬间动词转化为表延续的动词。英语动词分为将瞬间动词和延续的动词。瞬间动词不能跟一段时间连用。例come这个单词,表示来，只发生在一瞬间。
He came here 10 minutes ago。
如果要表示他来这里已经10分钟了。我们不能说
He came here for 10 minutes.
只能变成He’s been here for 10 minutes.
Comef转换成be here.
总结：瞬间动词不能跟一段时间连用，要转换成延续性动词。
我们看多一个例子。
Borrow 表示借，是瞬间动词。
如果要表示他借去一段时间了我们就要变成延续性动词。
Borrow 改成keep
不能说成Lisa borrowed my books for a month.
只能改成Lisa has kept my book for a month./Lisa borrowed my book in one month ago.
瞬间动词只能发生在一个时间点不能跟for /since连用。，如果要描写这个瞬间动词持续一段时间就要将瞬间动词转换成连续性动词。或用be+
名词／形容词或副词／介词短语名词／形容词或副词／介词短语来表示状态。
如下是一常用例子：
arrive→be here
begin(start)→be on
die →be dead
come / get back—be back
leave →be away (from)
fall ill(sick,asleep)→be ill(sick,asleep)
get up→be up
go out →be out
finish →be over
be on open →be open
join →be in be a member of„
close →be closed
go to school→be a student
borrow →keep
buy/get →have
catch(a cold)→ have(a cold)
get to know →know
begin to study→study
come to work→work
move to →live in
finish/end → be over
come to → be in
sit down → be seated
marry → be married
dress → be dressed
put on—be on / wear
go to town—be in town
lose—be missing
open —be open
begin /start—be on
return--be back
finish--be over
become--be
come / go to —be in / at
arrive in （at）/ get to / reach——be in / at
get /receive a letter from—have a letter from
