"изучавал" meaning in Bulgare

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en bulgare",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Bulgare",
      "orig": "bulgare",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Bulgare",
  "lang_code": "bg",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "изучавам"
        }
      ],
      "glosses": [
        "Participe passé actif masculin de изучавам."
      ],
      "id": "fr-изучавал-bg-verb-SUqS7dWG",
      "tags": [
        "form-of"
      ]
    },
    {
      "form_of": [
        {
          "word": "изучавам"
        }
      ],
      "glosses": [
        "Participe imparfait masculin de изучавам."
      ],
      "id": "fr-изучавал-bg-verb-TOtBB3Nf",
      "tags": [
        "form-of"
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "изучавал"
}

{
  "categories": [
    "Formes de verbes en bulgare",
    "bulgare"
  ],
  "lang": "Bulgare",
  "lang_code": "bg",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "изучавам"
        }
      ],
      "glosses": [
        "Participe passé actif masculin de изучавам."
      ],
      "tags": [
        "form-of"
      ]
    },
    {
      "form_of": [
        {
          "word": "изучавам"
        }
      ],
      "glosses": [
        "Participe imparfait masculin de изучавам."
      ],
      "tags": [
        "form-of"
      ]
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "изучавал"
}