非谓语动词的形式变化:
不 定 式 主 动 被 动
一 般 to write to be written
进 行 to be writing /
完 成 to have written to have been written
完成进行 to have been writing /
现在分词 主 动 被 动
一 般 writing being written
完 成 having written having been written
过去分词 一般 written
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