"-sun" meaning in Turkish

{
  "head_templates": [
    {
      "args": {
        "1": "tr",
        "2": "suffix form"
      },
      "expansion": "-sun",
      "name": "head"
    }
  ],
  "lang": "Turkish",
  "lang_code": "tr",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Turkish entries with incorrect language header",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "You are happy.",
          "text": "Mutlusun.",
          "translation": "You are happy.",
          "type": "example"
        }
      ],
      "glosses": [
        "Suffix of verb \"to be\" for subject \"you\" (informal)."
      ],
      "id": "en--sun-tr-suffix-l6yDnndD",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-sun"
}

{
  "head_templates": [
    {
      "args": {
        "1": "tr",
        "2": "suffix form"
      },
      "expansion": "-sun",
      "name": "head"
    }
  ],
  "lang": "Turkish",
  "lang_code": "tr",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Turkish entries with incorrect language header",
        "Turkish non-lemma forms",
        "Turkish suffix forms",
        "Turkish terms with usage examples"
      ],
      "examples": [
        {
          "english": "You are happy.",
          "text": "Mutlusun.",
          "translation": "You are happy.",
          "type": "example"
        }
      ],
      "glosses": [
        "Suffix of verb \"to be\" for subject \"you\" (informal)."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-sun"
}