现在完成时
1.He has been here for five days
2.He has lived here since 1980.
3.I have already read the book.
4.He hasn't read the bopk yet.
5.I have just read the book.
6.Have you ever been to Beijing?
7.So far,we have learned 10 English songs.
8.We haven't seen each other for a long time.
9.Great changes have taken place in my hometown for the past(last) few years.
10.They have seen the film for several times.