字典例句:I hope you're done writing that paper because class starts in three minutes.
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be done为习语,其中done被认为是形容词作表语。done=finished. 其实这是早期英语的一种残留形式。在英语发展的某个时期,英语的完成时态 have done和be done是通用的。例如 He is gone. = He has gone. 不过现在把He is gone. 分析为系表结构。be done doing sth= have finished doing sth. 意为做完某事,不再做某事。不可以改为have done doing sth.
例如: I try to put things in their place once I am done using them. = ... once I have finished using them.
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