〜とは限らない
Formation
N3
Meaning
Not necessarily... / Not always... Expressions used to state that something is not always true, or that there are exceptions.
Examples
毎日練習しても、試合に勝てるとは限らない。
Even if you practice every day, it doesn't necessarily mean you can win the match.
一生懸命勉強しても、合格できるとは限らない。
Even if you study hard, it doesn't necessarily mean you can pass.
値段が高ければ、必ずしも質がいいとは限らない。
If the price is high, it doesn't necessarily mean the quality is good.
便利な生活が、必ずしも幸せだとは限らない。
A convenient life is not necessarily a happy one.
あの人が言ったことが、真実だとは限りません。
What that person said is not necessarily the truth.