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1)had been done,2) had done, 3)have/has done, 4)have/has been doing....
1) & 2) past perfect ----- Have to show comparsion
3) & 4) present perfect --- something still affect now...
1) vs 2)
1. Had been done.
首先要知道这个一个有duration的比较, 而且被动语气。
2. had done
首先要知道这个一个结果(result)的比较,而且是主动语气。
example:
He told me, he ______ (learn) english for 15 years.
He told me, he _______(not meet) Mr. Brown yet.
句子第一句话中有个时间,所以是duration. 多久? 15年。
句子第二句话中是个结果,还没见到呢。
another example:
I haD already released my little brother 10mins before my mom came home and yelled at me for teasing him.
My little brother haD already been relased by me before my mom came home and yelled at me for teasing him.
所以第一句话是: had been learning
第二句话是: hadn't met
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