短暂性动词,又叫瞬间动词,表示短暂、瞬间完成的动作,如die, join, leave, become, return, reach, etc.
延续性动词表示的动作不但可以延续,而且可以产生持久的影响。常见的这类动词有:be,have,keep,know,learn,lie,live,read,sing,sleep,stand,stay,wait,walk,watch等。
延续性动词常见于现在
完成时中的句子中,且常与for,how,long,since等引导的表示一段时间的状语或
状语从句连用。例如:
1.I have learned
more than 1,000 Chinese words since I came to China.
自从来到中国,我已经学会了l,000多个汉字。
2.We have lived in Linqing since we came here.自从来到这儿,我们就一直住在
临清。
3.I have kept the picture for about three years.这张画我保存了大约三年。
瞬间动词构成的完成时,不可以用表示一段时间的状语(如:since 和for引导的短语)来修饰,它不能表示动作的延续,因此不能用表示一段时间的状语来修饰。
如可以说:The
Red Cross has already started for the earthquake-stricken area.
但不可说:The Red Cross has already started for the earthquake-stricken area for three days.