having been doing表示主动么?
主动与被动的一个重要标志就是be 后面是现在分词还是过去分词.
现在分词---主动
过去分词---被动那如果说一个动作是被动的，从过去一直持续到现在并将一直持续下去，用什么结构的短语呢？完成进行式难道都是主动？
主动与被动的一个重要标志就是be 后面是现在分词还是过去分词.
现在分词---主动
过去分词---被动那如果说一个动作是被动的，从过去一直持续到现在并将一直持续下去，用什么结构的短语呢？完成进行式难道都是主动？
主动与被动的一个重要标志就是be 后面是现在分词还是过去分词.
现在分词---主动
过去分词---被动那如果说一个动作是被动的，从过去一直持续到现在并将一直持续下去，用什么结构的短语呢？完成进行式难道都是主动？
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