Quote:
Originally Posted by masaegu
だった = past tense for です. I don't have to explain what です means, do I?
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No it's not. 'desu' is the polite expression for state of being. The past tense of 'desu' is 'deshita'.
'da' is considered to be informal, because it's 'stronger'. If you use 'da' at the end of a phrase you declare that it IS that way, which is considered to be more informal.