e +ing形式 系表结构 无论be变成哪种时态形式如果后接动词 要不就是过去分词 要不就是现在分词（过去分词表示被动状态,而现在分词表示持续动作或所处的某种偏主动的状态）.
i 've been waiting for you for an hour .为什么这个 have been 后面 带
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