一般过去时。was done包含两种语法，一个是被动语态be+done，还有一个是一般过去时。一般过去时的被动语态构成：was / were + 及物动词的过去分词。
示例：
主：He bought his children some pens.
被：Some pens were bought for his children by him.
被动语态的特殊结构形式
1、带情态动词的被动结构。其形式为：情态动词＋be+过去分词。
The baby should be taken good care of by the baby-sitter.
2、有些动词可以有两个宾语，在用于被动结构时，可以把主动结构中的一个宾语变为主语，另一宾语仍然保留在谓语后面。通常变为主语的是间接宾语。
His mother gave him a present for his birthday.可改为He was given a present by his mother for his birthday.
3、当“动词＋宾语＋宾语补足语”结构变为被动语态时，将宾语变为被动结构中的主语，其余不动。
Someone caught the boy smoking a cigarette.可改为The boy was caught smoking a cigarette.
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