母語は？what´s your mother tongue?

[sawori]

日本語です。

仕事で英語を使う為、猛勉強中です。

[Kawano Katsuhito]

スペイン語。

[MFoogle]

英語ですが、スペイン語も日本語も学んでいます。
English, but I'm also studying Spanish and Japanese too.
Inglés, pero estoy estudiando español y japonés también.

[KiZA]

English!! =3

[iev]

ロシア語

[Devros_]

私の母語はフランス語です。　
Or maybe I should say Acadian French because it's a dialect very different from standard French.

[Dimension]

Swedish, but I'm pretty much fluent with English as well.

[adonis0418]

僕の母語は中国語ですけと、僕はスイスの株式会社の通訳だから、英語と中国語を話せって、ちょっと少し日本語を話せますね。

[astaroth]

伊語（イタリア語）です。
My mother tongue is Italian, but I moved to US six years ago and started learning Japanese here.
Few grammatical aspects like dropping the subject, or some expressions like ーて見る (to try to do), or pronunciation like the "long consonant" (as in あっと) are natural to me, because all very similar to Italian but so different to English.

ps in Italian to try to do can be expressed as vedere di fare, where vedere translates into to see, that is 見る.

[Stone_Cold]

My native tongue’s American English.

[Eddie63]

I always get a kick of seeing people staring in silence when I say:
kirundi.
It kills me everytime.

[adriannrod]

英語です。English.

Hehe, I didn't even have to pull out the IME for that one... Copy/paste various other bits.

If it has to be said, I do speak American English, though I'm capable of speaking British. Honestly, they're only slightly different, and American English has a ton more subtleties. XD British English has stresses on strange syllables, and less vowel sounds, from what I've heard. Still basically the same.

I feel lucky to have learned English first, as it seems that if was my 2nd language, it would be an insurmountable task, although that's how Mandarin seems to me right now...

I'm also learning:
フランス語 (French is fun!)
ロシア語 (I love certain Russian music!)
スペイン語 (I'm una Mexicana, )

And too many others to count, including Korean! I love languages, and cultures! If I didn't want to be a translator so bad, I'd be an anthropologist!

Now that I look, I feel like I'm straying away from the topic, if not sprinting away, so I'll end it here.

[Ash96]

...which is just a mutilated version of english :p
(american english hurts my ears >.<)

Actually American English is closer to Middle English. The British stopped using words that we (Americans) still use like trash(US)=rubbish(UK), where trash was used in the UK around the time the firest British crossed the Altantic. It's the British English that changed not American English, so no mutilation has been done, thank very much.

EDIT: actually some British accents sound mutilated to me. They don't enunciate very well, I can barely understand them sometimes.

[paraguaijin]

スペイン語です。

[ILuvEire]

英語です、けどイタリア語とドイツ語も話せます、とロシア語と日本語学びます。
English, but I also speak Italian and German, and I'm studying Russian and Japanese.