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The Perfect Progressive Tenses | Britannica Dictionary

To form the perfect progressive, use the appropriate tense of the verb have with been and the progressive (-ing) tense of the main verb.

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查詢 「Have been ing」的人也找了：

  1. have been ving意思
    2.
  2. have been用法
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  3. have been ed用法
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  4. have been pp用法
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  5. have been意思
    6.
  6. 現在完成進行式
    7.
  7. 過去完成進行式
    8.
  8. Have been Ved
    9.