Done的用法

一般现、过用be done, be有人称、时、数变
例：1、主动：The children gave the foreign guests a warm welcome.
被动：The foreign guests were given a warm welcome by the children.
孩子们热烈地欢迎外宾。
2、主动：People regard him as brilliant.
被动：He is regarded as brilliant by people.
人们认为他很有才华。
以上两例都是一般时态用be done的例子，be有人称、时、数变，第三人称foreign friends是复数，时态一般过去时，所以"be done"就是were given，而People regard him as brilliant一句，被动后的"be done"就变成单数第三人称is regarded的形式了。
完成时态have done，被动将been加中间。
(过去完成时had done也包括在内)。
例：1、主动：We have studied English for 3 years off and on at the spare-time school.
被动：English has been studied for 3 by us years off and on at the spare-time school. (have随新主语变为has)
我们已经在夜校里断断续续地学了三年英语了。
2、主动: They had produced 100 tractors by the end of last year.
被动: 100 tractors had been produced by the end of last year.