"должно быть" meaning in Russian

{
  "forms": [
    {
      "form": "должно́ быть",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "dolžnó bytʹ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "должно́ быть"
      },
      "expansion": "должно́ быть • (dolžnó bytʹ)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_literal_offsets": [
            [
              10,
              17
            ]
          ],
          "bold_roman_offsets": [
            [
              5,
              16
            ]
          ],
          "bold_text_offsets": [
            [
              6,
              18
            ]
          ],
          "english": "She must've been so frightened.",
          "literal_meaning": "She, (it) must be, was so frightened.",
          "roman": "Oná, dolžnó bytʹ, bylá tak napúgana.",
          "text": "Она́, должно́ быть, была́ так напу́гана.",
          "type": "example"
        },
        {
          "bold_english_offsets": [
            [
              22,
              30
            ]
          ],
          "bold_text_offsets": [
            [
              52,
              64
            ]
          ],
          "english": "From a long way away, probably from outside the town, came the croaking of frogs.",
          "ref": "1903, Антон Чехов [Anton Chekhov], “chapter I”, in Невеста, Санкт-Петербург: Журнал для всех; English translation from Robert Payne, transl., The Bride, New York: Alfred A. Knopf, 1963:",
          "roman": "Slýšno býlo, kak gdé-to dalekó, óčenʹ dalekó, dolžnó bytʹ, za górodom, kričáli ljagúški.",
          "text": "Слы́шно бы́ло, как где́-то далеко́, о́чень далеко́, должно́ быть, за го́родом, крича́ли лягу́шки.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Used as a parenthetical to express a speaker's opinion that something is certain, analogously to English \"must\"."
      ],
      "id": "en-должно_быть-ru-adv-A66cEB-D",
      "links": [
        [
          "must",
          "must#English"
        ]
      ],
      "synonyms": [
        {
          "word": "наве́рное"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[dɐɫʐˈno bɨtʲ]"
    }
  ],
  "word": "должно быть"
}

{
  "forms": [
    {
      "form": "должно́ быть",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "dolžnó bytʹ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "должно́ быть"
      },
      "expansion": "должно́ быть • (dolžnó bytʹ)",
      "name": "ru-adv"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Russian adverbs",
        "Russian entries with incorrect language header",
        "Russian lemmas",
        "Russian multiword terms",
        "Russian terms with IPA pronunciation",
        "Russian terms with quotations",
        "Russian terms with usage examples"
      ],
      "examples": [
        {
          "bold_literal_offsets": [
            [
              10,
              17
            ]
          ],
          "bold_roman_offsets": [
            [
              5,
              16
            ]
          ],
          "bold_text_offsets": [
            [
              6,
              18
            ]
          ],
          "english": "She must've been so frightened.",
          "literal_meaning": "She, (it) must be, was so frightened.",
          "roman": "Oná, dolžnó bytʹ, bylá tak napúgana.",
          "text": "Она́, должно́ быть, была́ так напу́гана.",
          "type": "example"
        },
        {
          "bold_english_offsets": [
            [
              22,
              30
            ]
          ],
          "bold_text_offsets": [
            [
              52,
              64
            ]
          ],
          "english": "From a long way away, probably from outside the town, came the croaking of frogs.",
          "ref": "1903, Антон Чехов [Anton Chekhov], “chapter I”, in Невеста, Санкт-Петербург: Журнал для всех; English translation from Robert Payne, transl., The Bride, New York: Alfred A. Knopf, 1963:",
          "roman": "Slýšno býlo, kak gdé-to dalekó, óčenʹ dalekó, dolžnó bytʹ, za górodom, kričáli ljagúški.",
          "text": "Слы́шно бы́ло, как где́-то далеко́, о́чень далеко́, должно́ быть, за го́родом, крича́ли лягу́шки.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Used as a parenthetical to express a speaker's opinion that something is certain, analogously to English \"must\"."
      ],
      "links": [
        [
          "must",
          "must#English"
        ]
      ],
      "synonyms": [
        {
          "word": "наве́рное"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[dɐɫʐˈno bɨtʲ]"
    }
  ],
  "word": "должно быть"
}