modality N1 rare writtenliterary
〜ではあるまいか — isn't it perhaps ~?
〜ではあるまいか ・ ではあるまいか
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See 〜ではあるまいか in real sentences
Jengo shows 〜ではあるまいか the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.