arimasen

Obviously, * Desu/deshita/de arimasen/de arimasen deshita * Masu/masen/mashita/masen deshita Then add a few more * if * while * want to <verb> * passive * honorific * etc.

You've never pondered the beauty and provenance of phrases like moushiwake arimasen or omachi kudasai, I take it?

Moushi-wake-arimasen is a phrase used to mean "there is no excuse [for what I have commited]".

While it should technically be -ku arimasen, it's actually rarely used, and -kunai desu is more "mainstream".

Polite negation is "suki de wa arimasen" Trivia: all these forms are really variations of "suki de aru".

Polite is "suki de wa arimasen deshita" (but again, the easy way is "suki de wa nakatta desu").

The wrong bit is that "tanoshikunai desu" should really be "tanoshiku arimasen".

Again to make it polite you can say "suki de wa arimasen deshita" (or "suki de wa nakatta desu" if you want to sound like an uneducated bumpkin like me).

> The wrong bit is that "tanoshikunai desu" should really be "tanoshiku arimasen".

Polite negation is "suki de wa arimasen" (though you can very much get away with the mistake of saying "suki de wa nai desu" -- again, every single child speaks this way).

If you want to make it polite, the polite past tense of "nai" is "arimasen deshita" (but you can get away with "nakatta desu" in virtually every situation).

"de ha arimasen" is really "de aru", with the "ha" for emphasis, and "aru" conjugated with the "masu" auxiliary at the negative form.

Moushi-wake-arimasen is a phrase used to mean "there is no excuse [for what I have commited]".

While it should technically be -ku arimasen, it's actually rarely used, and -kunai desu is more "mainstream".

Polite negation is "suki de wa arimasen" Trivia: all these forms are really variations of "suki de aru".

Polite is "suki de wa arimasen deshita" (but again, the easy way is "suki de wa nakatta desu").