For years I have been saying "またまた" for "see you" to Japanese people I meet. Well at least half the time, since I also often say "またね". But only tonight for the first time did anybody pick me up on ...
What the difference between saying さようならだ and さようなら? If it had to guess I would be what seems to be obvious, one is declaring it to be goodbye-but is this the case? I've never heard さようならだ used ...