I have already borrowed aபைடு நூலகம்book. √
I have borrowed a book for two weeks.
不能说: *He has come to Beijing for two years. *He has bought that book for three weeks. *He has joined the Army for one and a half years. *His grandma has died for nine months.
I have just finished my homework.
They have never visited the Great Wall before.. Have you ever been to Hong Kong before?
(4) 用表示到说话为止的过去时间状语, 如so far/up to now, in the past/ last few years等。
We have learned 1,000 English words
_s_i_n_c_e__ we came to this school.
注意: 瞬间动词的肯定式不能和时间段状语连用。
如:
come, go , leave, arrive, buy, lose, receive,
join, die, open, close, become, begin, start, borrow, stop, marry 因为它们所表示的动作是 一时的, 不能延续的, 故不能与for …, since … 等表示一段时间的状语连用。不过,瞬间动词的否定式 是可以与表示持续的时间状语连用, 即动作的不发生是可以持续的。