かどうかCommon wordMeanings1expressionwhether or not; ifUsed to embed a yes/no question within a sentence. Follows the plain form of verbs, adjectives, or nouns.彼かれが来くるかどうか分わからない。I don't know whether he will come or not.それが本ほん当とうかどうか確たしかめてください。Please check whether that is true.