だいかis it? (informal questioning)だいですかis it? (polite questioning)だいだいisn't it? (colloquial assurance)だいじゃないisn't it? (negative assurance)だいのis it a…? / is it that…? (seeking confirmation)だいってisn’t it said that…? (quoting confirmation)だいかなI wonder if it is… (expressing doubt)だいじゃなかったwasn’t it? (past negative confirmation)どうだいhow about it? / what about that? (asking for opinion)