- Learning is never seasonal.
学习是永无止境的
《歌舞青春》
现在完成时 Present Perfect
- 形式： have/has + done
- 用法：
现在全部完成 He has left.
现成部分完成 We have studied English for ten years.
We have not won the match.
过去完成时 Past Perfect
- 形式： had + done
- 用法： 过去的之前
When he got there, she had left. She was not there.
将来完成时 Future Perfect
- 形式：will / shall have done
- 将来的之前
完成进行时 = “完成” + “进行”，时间的之前，强调进行的过程
现在完成进行时
We have been working hard for several months.
过去完成进行时
had been doing
将来完成进行时
will have been doing
- 完成时 vs. 完成进行时
They _____ on the program for almost one week before I joined them, and now we
are still working on it as no good results _____ so far.
A. have been working; have come out
B. had worked; came out
C. had been working; have come out
D. have worked; are coming out
答案： C