"future perfect continuous" meaning in English

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      "expansion": "future perfect continuous (plural not attested)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "orig": "en:Tenses",
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      ],
      "glosses": [
        "A tense used to express an ongoing action completed after some time in the future; in English formed by use of will have been (or shall have been) and a present participle."
      ],
      "id": "en-future_perfect_continuous-en-noun-P8iO8Fw6",
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          "grammar",
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        [
          "present participle",
          "present participle"
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      "raw_glosses": [
        "(grammar) A tense used to express an ongoing action completed after some time in the future; in English formed by use of will have been (or shall have been) and a present participle."
      ],
      "related": [
        {
          "word": "future continuous"
        },
        {
          "word": "future perfect"
        }
      ],
      "synonyms": [
        {
          "word": "future perfect progressive"
        }
      ],
      "tags": [
        "no-plural"
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ],
      "translations": [
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "grammar: a tense used to express an ongoing action completed after some time in the future",
          "word": "folyamatos befejezett jövő"
        },
        {
          "code": "ml",
          "lang": "Malayalam",
          "roman": "tuṭaṟccābhāvikālaṁ",
          "sense": "grammar: a tense used to express an ongoing action completed after some time in the future",
          "word": "തുടർച്ചാഭാവികാലം"
        }
      ]
    }
  ],
  "word": "future perfect continuous"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "future continuous"
    },
    {
      "word": "future perfect"
    }
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      "glosses": [
        "A tense used to express an ongoing action completed after some time in the future; in English formed by use of will have been (or shall have been) and a present participle."
      ],
      "links": [
        [
          "grammar",
          "grammar"
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      "raw_glosses": [
        "(grammar) A tense used to express an ongoing action completed after some time in the future; in English formed by use of will have been (or shall have been) and a present participle."
      ],
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        "no-plural"
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        "sciences"
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  "synonyms": [
    {
      "word": "future perfect progressive"
    }
  ],
  "translations": [
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "grammar: a tense used to express an ongoing action completed after some time in the future",
      "word": "folyamatos befejezett jövő"
    },
    {
      "code": "ml",
      "lang": "Malayalam",
      "roman": "tuṭaṟccābhāvikālaṁ",
      "sense": "grammar: a tense used to express an ongoing action completed after some time in the future",
      "word": "തുടർച്ചാഭാവികാലം"
    }
  ],
  "word": "future perfect continuous"
}