什么时候用been down什么时候用was/were done 什么时候用been？什么时候用done？
\u4ec0\u4e48\u65f6\u5019\u7528would have been1\u3001would have been\u901a\u5e38\u7528\u5728\u865a\u62df\u8bed\u6001\u4e2d\uff0c\u8868\u793a\u5c06\u4f1a\u505a\u4e0e\u8fc7\u53bb\u4e8b\u5b9e\u76f8\u53cd\u7684\u52a8\u4f5c\u3002
2\u3001would have been\u5c31\u5c5e\u4e8ewould have done\u7684\u53e5\u5f0f\uff0c\u5176\u4e2dbeen\u662fbe\u7684\u8fc7\u53bb\u5206\u8bcd\u3002
\u62d3\u5c55\u8d44\u6599
would have been
1\u3001It would have been virtually impossible to research all the information.
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2\u3001What I did was right and if I had done anything less it would have been wrong
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3\u3001It would have been rough justice had he been deprived of this important third European win.
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4\u3001My daughter would have been 17 this week if she had lived
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5\u3001He made a promise to his great-grandfather? That would have been a long time ago
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6\u3001I would have been much wiser to start my own pension plan when I was younger.
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7\u3001I don't believe for one minute she would have been scared
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8\u3001Before we had our child the idea of staying in every night would have been horrific.
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\u4e00.have/has been doing sth.
1.\u73b0\u5728\u5b8c\u6210\u8fdb\u884c\u65f6
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\u73b0\u5728\u5b8c\u6210\u8fdb\u884c\u65f6.
\u5982:I have been skating for 4 hours.
I have finished my homework.
2.\u73b0\u5728\u5b8c\u6210\u65f6\u7684\u88ab\u52a8\u8bed\u6001.
\u540e\u63a5\u52a8\u8bcd\u7684\u8fc7\u53bb\u5206\u8bcd.
\u5982:The building has been built for 5 years.
\u4e8c.\u4e00\u822c\u73b0\u5728\u65f6:\u7528\u52a8\u8bcd\u539f\u5f62
\u4e00\u822c\u8fc7\u53bb\u65f6:\u7528\u52a8\u8bcd\u7684\u8fc7\u53bb\u5f0f
\u4e00\u822c\u5c06\u6765\u65f6:will/shall+do
is/am/are going to do
\u8fc7\u53bb\u5c06\u6765\u65f6:could/would do
\u73b0\u5728\u5b8c\u6210\u65f6:have/has done
\u8fc7\u53bb\u5b8c\u6210\u65f6:had done
\u5c06\u6765\u5b8c\u6210\u65f6:shall have done
\u8fc7\u53bb\u5c06\u6765\u5b8c\u6210\u65f6:would/could have done
\u73b0\u5728\u8fdb\u884c\u65f6:is/am/are doing
\u8fc7\u53bb\u8fdb\u884c\u65f6:was/were doing
\u5c06\u6765\u8fdb\u884c\u65f6:will/shall be doing
\u8fc7\u53bb\u5c06\u6765\u8fdb\u884c\u65f6:would/could be doing
\u73b0\u5728\u5b8c\u6210\u8fdb\u884c\u65f6:have/has been doing
\u8fc7\u53bb\u5b8c\u6210\u8fdb\u884c\u65f6:had been doing
\u5c06\u6765\u5b8c\u6210\u8fdb\u884c\u65f6:shall have been doing
\u8fc7\u53bb\u5c06\u6765\u5b8c\u6210\u8fdb\u884c\u65f6:would have been doing
was/were done，是一般过去时，被动语态，意思是“被完成”。
been done
由于完成时态
was done
用于一般过去时态
扩展阅读：be been done是什么时态 ... have been down怎么用 ... having been done ... 什么时候用has been ... 什么时候用have been done ... have been toned down ... been down this road ... has been shut down ... had been down什么时态 ...
