"when's" meaning in English

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  "lang_code": "en",
  "pos": "contraction",
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      "alt_of": [
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          "word": "when is"
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      "examples": [
        {
          "text": "When's the next train?"
        }
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      "glosses": [
        "Contraction of when is."
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      "alt_of": [
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          "word": "when has"
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      "examples": [
        {
          "text": "When's he said he's coming?"
        }
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        "Contraction of when has."
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      "raw_glosses": [
        "(informal) Contraction of when has."
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    {
      "alt_of": [
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          "word": "when does"
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        {
          "text": "When's the next train arrive?"
        }
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      "glosses": [
        "Contraction of when does."
      ],
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          "does",
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      "raw_glosses": [
        "(informal) Contraction of when does."
      ],
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    {
      "alt_of": [
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      "examples": [
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          "text": "When's the last time you went snorkeling?"
        }
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        "Contraction of when was."
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        "(colloquial) Contraction of when was."
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  "sounds": [
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      "ipa": "/wɛnz/"
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      "homophone": "wens (in accent with the wine-whine merger)"
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      "enpr": "wĕnz"
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  "word": "when's"
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{
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    "English terms with homophones",
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  "lang_code": "en",
  "pos": "contraction",
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    {
      "alt_of": [
        {
          "word": "when is"
        }
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        "English contractions"
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      "examples": [
        {
          "text": "When's the next train?"
        }
      ],
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        "Contraction of when is."
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          "word": "when has"
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        {
          "text": "When's he said he's coming?"
        }
      ],
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        "Contraction of when has."
      ],
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          "when",
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          "has",
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        "(informal) Contraction of when has."
      ],
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        "alt-of",
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    },
    {
      "alt_of": [
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          "word": "when does"
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      "examples": [
        {
          "text": "When's the next train arrive?"
        }
      ],
      "glosses": [
        "Contraction of when does."
      ],
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        [
          "when",
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        ],
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        "(informal) Contraction of when does."
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        {
          "text": "When's the last time you went snorkeling?"
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        "Contraction of when was."
      ],
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          "was",
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        "(colloquial) Contraction of when was."
      ],
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        "abbreviation",
        "alt-of",
        "colloquial",
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  ],
  "sounds": [
    {
      "ipa": "/wɛnz/"
    },
    {
      "rhymes": "-ɛnz"
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      "homophone": "wens (in accent with the wine-whine merger)"
    },
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  "word": "when's"
}