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Does だ have a -ず form? Millie 14:31, 30 December 2005 (UTC)

No. The negative form of だ is ではない or じゃない。―Gliorszio 14:56, 30 December 2005 (UTC)

formality/usage differences in different forms[edit]

Is there any difference in how the different forms (for example, "de wa nai" and "ja nai") are used? Are they at different formality levels, or used by different populations of speakers? -- Creidieki 16:01, 21 November 2006 (UTC)

As it is explained in w:Japanese language#Politeness, basically you can classify them by the politeness. "Da" is in the plain form, and "desu" is the equivalent in the polite form. Both "de wa nai" and "ja nai" are in the plain form, but the former is a bit more formal than the later, which can be said as the euphonically changed form of it. It's the same thing as "are not" and "aren't." --Tohru 17:14, 21 November 2006 (UTC)