Grammar Info
N3 Lesson 7: 14/21

とは限(かぎ)らない
not necessarily so, is not always true, there is no guarantee that

Structure
Casual
Formal
Verb + 限らない
[い]Adjective + 限らない
[な]Adjective + + 限らない
Noun + + 限らない
Verb + 限りません
[い]Adjective + 限りません
[な]Adjective + + 限りません
Noun + + 限りません
Details
Register Formal
使用域 硬い
Information
とは限(かぎ)らない is regularly used to convey the meaning of ‘(A) is not necessarily so’, or ‘there is no guarantee that (A)’. This expression utilizes the 格助詞(かくじょし) (case marking particle) と in its use for highlighting 結果(けっか) ‘results’, the 副助詞(ふくじょし) (adverbial particle) は, and the negated form of the う - Verb 限(かぎ)る ‘to limit’.
This structure may be used with verbs, い-Adjectives, な-Adjectives, or nouns. However, will be required after な-Adjectives and nouns.
  • 日本(にほん)2年(ねん)間(かん)住(す)んでいるからといって、日本語(にほんご)話(はな)せるとは限(かぎ)らない
    It is not limited to a person being able to speak Japanese just because they have lived in Japan for 2 years.
  • 日(ひ)出(で)てても暖(あたた)かいとは限(かぎ)らない
    Just because the sun is out, doesn't necessarily mean that it is warm.
  • 田舎(いなか)も静(しず)かだとは限(かぎ)らない
    A place being rural doesn't necessarily mean that it is quiet.
  • 社長(しゃちょう)だからといって乗(の)っている車(くるま)高級車(こうきゅうしゃ)だとは限(かぎ)らない
    It is not limited to him driving a luxury car, just because he is the CEO.
限(かぎ)らない literally means ‘to not be bound’, or ‘to not be limited’. Therefore, despite と highlighting a result, that result is then being clarified as ‘not the only possibility’.
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すべての人間(にんげん)が上手(じょうず)歌(うた)えるとは限(かぎ)らない
It is not necessarily true that everybody can sing well.
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毎年(まいとし)の冬(ふゆ)に必(かなら)ず雪(ゆき)降(ふ)るとは限(かぎ)らない
It is not necessarily the case that it will snow every winter.
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彼女(かのじょ)が「愛(あい)している」と言(い)ってくれても、離婚(りこん)しないとは限(かぎ)らない
Just because she says she loves you doesn’t necessarily mean you won't get a divorce.
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Books
Tobira
Page 333
[AIAIJ] An Integrated Approach to Intermediate Japanese
Page 114