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1.现在完成进行时(Present Perfect Progressing Tense)由have/has+been+动词的现在分词(即动词的ing形式)构成,表示动作从过去的某个时刻开始,继续到现在,可能继续下去,也可能刚刚结束。
1.Present Perfect Progressing Tense is composed of the present participle of the have/has+been+ verb (ie, the verb form of verb). It indicates that the action has started from a certain point in the past and continues to the present. It may continue. It may have just ended.