have /has been doing 是什么句型啊

have /has been doing 是什么句型啊 have /has been doing 是什么时态 has been doing have been done区别 i has been doing 还是i have been doing have/has been doing否定形式 have been doing是什么时态? 现在完成进行时的句型是 主语+助动词have/has+been+doing,若没有动词,则为 现在完成时进行时“have/has been后是不是+doing?" 现在分词是什么意思?过去分词又是什么? 英语中have been；has been是什么? 用have been doing 句型早十句话! have been doing sth是什么时态? what have they been doing 是什么时态