～とはかぎらない — Not Always the Case
States that something is not necessarily true or does not always hold, allowing for exceptions. It denies a generalization by pointing out that it isn't guaranteed in every case. Often used to caution against assuming a rule is universal.
Structure
[Plain form] + とは限らない
Examples
高い物が良い物だとは限らない。
Takai mono ga yoi mono da to wa kagiranai.
Expensive things aren't necessarily good things.
良い物だ + とは限らない denies the generalization, allowing exceptions.
努力すれば必ず成功するとは限らない。
Doryoku sureba kanarazu seikou suru to wa kagiranai.
Making an effort doesn't always guarantee success.
成功する + とは限らない says the outcome isn't certain in every case.
有名な店がおいしいとは限らない。
Yuumei na mise ga oishii to wa kagiranai.
A famous restaurant isn't necessarily delicious.
おいしい + とは限らない cautions against assuming the rule always holds.
• Function: denies that a generalization is always true; leaves room for exceptions. • Often reinforced by 必ずしも at the front of the clause. • は may be dropped in casual speech (とも限らない adds 'nor can we say for sure').
Commonly confused with
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ～とはかぎらない is tested against.
vs というものではない
というものではない rejects an idea as an oversimplified principle, while とは限らない simply states a generalization isn't guaranteed to hold every time.
vs わけではない
わけではない denies a specific conclusion in context, whereas とは限らない denies the universality of a general rule.
More modal expressions
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