begin 是瞬间动词 为什么还有had begun的用法？

begin的确是瞬间动词，它完全可以用于现在完成时态，表示“……已经开始”。例如：When I got to the cinema, the film had already begun.（我到达影院时，电影已经开始了。）只不过瞬间动词不能够与表示一段时间的状语(如：for three days, since I came here等）连用，因为瞬间动词不能够延续；若要表示“……开始多久了”，常用be on表示，如：电影已经开始半个小时了。(The film has been on for about half an hour.) 类似的还有：
(1)I have bought a book.我买了一本书。
购买 buy ——have（拥有）
I bought the book two days ago.
I have had the book for three days.
(2)I have already borrowed a pen.我已经借来了一支钢笔。
借来borrow——keep（保存、保留）
I borrowed the pen last week.
I have kept the pen for a week.
非延续性动词绝对不可以和表示段时间的状语连用，若表示延续性意义，可以转换其他方式或用其他类似的词（或词组）。再如：
他入党三年了。
可译为：
He has been a Party member for three years.
He has been in the Party for three years.
It's three years since he became a Party member.
He became a Party member three years ago.

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