Verb ない form + とも限らない

[It's not impossible that; there's a chance that]

Connection: Verb ない form + とも限らない

Usage: Expresses that while something is unlikely, it cannot be completely ruled out. Used to warn about a possibility or to express caution.

Nuance: A double negative that creates a weak positive — "it's not that it definitely won't happen." Often used when advising someone to be prepared for an unlikely but possible scenario.

Examples:

明日、地震が来ないとも限らない。(It's not impossible that an earthquake could come tomorrow.)

彼が反対しないとも限らないから、事前に相談した方がいい。(There's a chance he might object, so it's better to consult him in advance.)

この計画が失敗しないとも限らないので、代替案も用意しておこう。(It's not impossible that this plan could fail, so let's prepare an alternative too.)