be sat
She was sat on the bench. sit 是不及物动词, 而在句中表示主动意义, 为什么在这里用被动语态呢?
在古英语中，及物动词的现在完成时采用 have + 过去分词形式，而不及物动词的现在完成时则采用 be + 过去分词的形式，例如，He is gone. She is come. 而在现代英语里，无论是及物动词还是不及物动词都采用 have + 过去分词的形式。不过，在现代英语里，某些表示移动和姿态的不及物动词，其现在完成时仍然保留着 be + 过去分词的形式。而且，这种形式，与 have + 过去分词的形式不同，着重表达状态或结果。有的语言学家(R. Quirk 等)基于这一点把这类句子归入“假拟被动句”(Pseudo-passives)。但是，这类句子毫无被动意义，与 be + 及物动词过去分词的形式(be drunk, be encouraged 等)是不同质的。
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All hope is gone. 毫无希望了。
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He's been stood here for an hour. 他在这儿站了一小时了。
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She is dressed elegantly. 她衣着高雅。
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He then asked me to be seated. 然后他让我坐下。
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The hostess dressed in her finest costume together with the guest of honor was seated comfortably in the living room. 女主人穿着非常漂亮的服装和主宾一起舒适地坐在起居室里。
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Grandfather was sat in his rocking chair. (CGEL) 祖父坐在摇椅里。
不难看出, was sat = was sitting, has been stood = has been standing. (参见 seated)