现在完成时或者过去完成时要用延续性动词。 例如：
I have bought this book.我买了这本书 但是要说明买了这本书有3年了就要用buy的延续性动词have. I have had this book for three years.下面是一些短暂性动词和延续性动词： leave --- be away, borrow --- keep, buy --- have, begin/start --- be on, die --- be dead, finish --- be over, join --- be in+组织机构, be a member of+组织机构, open sth --- keep sth open, fall ill --- be ill, get up---be up, catch a cold --- have a cold, come here --- be here, go there --- be there, become --- be, come back --- be back, fall asleep --- be asleep, get to/ arrive/reach --- be (in), leave --- be away from, get to know --- know, go (get) out →be out， put on→ wear；catch a cold →have a cold等。 例:The old man died 4 years ago. ----The old man has been dead for 4 years. ---- It is 4 years since the old man died. ----Four years has passed since the old man died. He joined the Party 2 years ago. -----He has been in the Party for 2 years. I bought the book 5 days ago. ---- I have had the book for 5 days.
没有了楼主。这些例句全都是现在完成时的句子你发现了吗？比如 买，总不会一直买这本书买三年吧。用延续性动词的意义就在于此。lz你要相信我 我初三了 不会连这个都不知道 只有现在完成和过去完成时需要用延续性动词
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