题目内容
8．这本字典你买多久了？How longhave youhad this dictionary？
分析 have； had．
解答 答案：have； had．这里是说这本字典是过去某一时间买的，询问动作持续了多久，用现在完成时have/has+过去分词，主语是you，故have，买buy是短暂性动词不能与how long多久连用，需换成持续性动词have，过去分词是had，故答案是have； had．
点评 瞬间动词可以用于现在完成时，但不能和表示一段时间的状语连用如：for 和since 所引导的时间状语都表示一段时间．那就要将瞬间动词转化为表延续的动词或者表状态的be+名词/形容词或副词/介词短语等．
leave-be away from buy-have
borrow-keep die-be dead get up-be up put on-be on/wear come/get back-be back go to town-be in town lose-be missing catch a cold-have a cold
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