1、I have been reading a book these days.这几天我一直在看一本书。
2、We have been working hard these days.这些天来，我们一直在努力工作。
3、They have been building a bridge.他们一直在造一座桥。
4、Amy has been playing her radio all morning.艾米整个上午一直开着她的收音机。
5、She lost her book.她丢失了她的书。
6、She didn't go to bed until she had finished her work.她直到把工作做完