误I have finished the book for a week.
正I finished the book a week ago.
正It is a week since I finished the book.
析finish是瞬间动词,不能和表示一段时间的状语连用。
你读完那本书后可以借给我吗?误Could I borrow that book when you've finished to read it?
正Could I borrow that book when you've finished reading it?
正Could I borrow that book when you've finished it?
析finish后可接动名词,不可接动词不定式,当动名词有宾语或者意思清楚时,也可省略动名词。