informal form of くださいは

[dudnaito]

なんですか？

[veganarchist]

Kudasai is Please give me; Please do for me and nan desu ka is what is/am/are?　ｏｒ　ｃａｎ　ｂｅ　ｕｓｅｄ　ａｓ　ｊｕｓｔ　Ｗｈａｔ？．
So to answer what i assume your question is; no なんですか　ｉｓｎ’ｔ　ｔｈｅ　ｉｎｆｏｒｍａｌ　ｖａｒｉａｔｉｏｎ　ｏｆ　ください　ａｎｄ　ｉ’ｍ　ｎｏｔ　ｓｕｒｅ　ｗｈａｔ　ｔｈｅ　ｉｎｆｏｒｍａｌ　ｖｅｒｓｉｏｎ　ｉｓ？　Ｙｏｕ　ｃｏｕｌｄ　ｔｒｙ　ｇｏｏｇｌｅ。

[Javizy]

If you're talking about as an auxiliary verb marking a request, then dropping ください is the informal form.

がんばってください！ ＞ がんばって！

You can also use imperatives, but you need to be a bit more careful with these. You'll probably want to wait until you learn them properly in your studies though, since there's conjugation and nuance to take into account.

きなさい
こい
くるんだ！

[QuackingShoe]

くれる is a less polite replacement for くださる, as well.

veganarchist, you ah.. might try reading his question again.

[veganarchist]

LoL Don't i feel stupid It was the ? after ka that threw me.

[taikutsu]

There is a form くれ that you may hear sometimes which means essentially the same thing, but it's not exactly the "informal" form of ください so much as sounding demanding. Normally you would just not say ください in "informal" speech.

[QuackingShoe]

くれ is the imperative form of くれる, mentioned ^

[victimofsleep1386]

くれ is the imperative form of くれる, mentioned ^

Not true. Kure and kureru are not related.
Naninani te-form + kure is male speech btw.
And imperative form for Group 2 verbs is +ro eg tabero.

[Javizy]

くれ is the imperative form of くれる, mentioned ^

Not true. Kure and kureru are not related.
Naninani te-form + kure is male speech btw.
And imperative form for Group 2 verbs is +ro eg tabero.

Why do you say they're unrelated? I don't know the history of the word and how くれ came to be used, but it clearly is used as the imperative form of くれる. Imperatives in general are common in "male speech", although that doesn't mean women don't use them at all.

You're not suggesting they're unrelated simply because it doesn't fit the conjugation rule, are you? くれろ brings up some results on Google (I didn't know it existed), but you'll be lucky to ever hear it.

Edit: I just found an explanation.

「日本語文法大辞典」によると、
「くれる」は下二段なので、規範的な命令形（文語）は「くれよ」、
室町期に「くれい」や「くれ」が使われるようになった。
江戸後期には、江戸語として「くれろ」の語形が見える、
とのことです。

下二→下一と変化した口語動詞では「-eろ/-eよ」という二つの
命令形を持つのが普通です。それに対し「くれる」は例外で、「くれろ」が一時
方言的に用いられただけで定着しなかった、ということではないでしょうか。
その理由としては、既に「くれい」「くれ」が普及していたことが考えられます。

一茶は若くして江戸に出たのでその地で「くれろ」に馴染んだのか、あるいは
故郷の信州でも「くれろ」が使われていたのか、興味深いところですが、真相
は浅学にして知りません。

[dudnaito]

thanks for the replies. Javizy as usual answered it succintly and quickly. Thank you all for the replies though.

[QuackingShoe]

As Javizy points out, it's merely an irregular verb. Despite what they say, there's a decent number of them.