完成时态：
1>现在完成时：站在现在看之前
形式 have/have + done .(过去分词)
用法：A：现在全部完成（过去的事对现在有影响）
B：现在部分完成（从过去持续到现在的事）
比如： 同学，你作业写得怎么样？【截止到现在回头往之前看：现在的之前】
你去朋友家找同学，同学不在家，他妈妈说他出去了。【现在的之前出去了】He has left .【现在全部完成】
We have studied English for ten years .【现在部分完成：现在还在学】
2>过去完成时：过去的之前发生的事
形式 had + done .(过去分词)
用法：过去的之前
When he got there , she had left .She was not there .(当他到的时候，她已经走了，她已经不在那里了)
3>将来完成时：将来的之前
形式 will/share have + done .(过去分词)
用法：将来的之前【阶段性总结：截止到某一个时间点回头看之前完成的结果】
截止到现在，我们已经上了三次课了（现在完成时）；
截止到上周，我们已经上了二次课了（过去完成时）；
截止到下周，我们就学完了（将来完成时）；
完成进行时态：“完成”+“进行” ； = xx时间的之前，强调进行的过程。
A.过去完成进行时：had been + doing
B.现在完成进行时：have/has been+ doing
C.将来完成进行时：will/shall have been+ doing
现在完成时和现在完成进行时的比较：
A：角度相同，都表示现在的之前。
B：现在完成：have/has + done ; 现在完成进行时：have/has been + doing .
C：强调不同：现在完成：强调结果（做完与否都可以） 现在完成进行：强调过程
We have not won the match .我们没赢得比赛。(强调结果)
We have been working hard for several months .我们已经努力了好几个月了。(强调过程)
They had been working one the program for almost one week before i joined them, and now we are still working on it as no good results have come out so far .
|
时态 |
过去 |
现在 |
将来 |
过去将来 |
|
一般 |
did |
do/does |
will do； am/is/are+going to do |
would do； was/were+going to do |
|
进行 |
was/were + doing |
am/is/are + doing |
will/shall + be doing |
would或者was/were going to+ V 原形 |
|
完成 |
had + done (过去分词) |
have/has + done (过去分词) |
will/shall have + done (过去分词) |
|
|
完成进行 |
had been + doing |
have/has been + doing |
will/shall have + been + doing |