Puncturing a Generalisation
とは限らない denies that something is always true. It leaves room for the usual case while refusing the absolute one.
- 高いものがいいとは限らない。(Expensive things aren't necessarily good.)
It never denies the statement outright — only its universality.
The Partner of からといって
The two arrive together constantly:
- 安いからといって品質が悪いとは限らない。(Cheap doesn't necessarily mean poor quality.)
からといって quotes the faulty inference; とは限らない rejects it. Learning them as a pair is more efficient than separately.
Against わけではない
| Pattern | Denies |
|---|---|
| わけではない | an interpretation of a specific situation |
| とは限らない | a general rule holding in all cases |
わけではない answers "so you hate it?". とは限らない answers "expensive means good, right?".
Often With 必ずしも
必ずしも strengthens the hedge and pairs almost exclusively with this pattern:
- 必ずしも正しいとは限らない。(It isn't necessarily correct.)
