Jesus Christ, 5? Wowza. I know Arabic, English, and HS/College level Spanish. I think in Arabic a lot. This is especially true when I am exclaiming something - phrases like "Oh My God", "come on", "are you serious", "what the hell", "fuck that guy, for realz", etc. etc. Arabic just exclaims better. You sound like you're pissed off. There's no room for sarcasm. On that note, if I get really angry, I will switch to Arabic mid-sentence. This has been known to frighten my friends. I speak in Arabic with my parents. There is a large divide in respect that my parents don't get when I speak to them in English. "What?" in English is very much different then "What?" in Arabic - the tone changes, English sounds more disrespectful to them. Poetry is more varied, and in my opinion, more beautiful in Arabic. There are just so many more words than there are in English. I can't even describe some of the words that are in Arabic, in English. It's why the Quran isn't understood by most English speakers. Any serious scholar has to know Arabic to really read the book. And even then, it might be better to grow up with the language, just to gain the context better. I'm not sure I agree with Klein on this last point: I think that growing up with two languages, that isn't the case. I can effectively find usages for English and Arabic, without tripping up in one or the other. I am good with both languages, equally. That being said, I suppose the interesting question is, does growing up with both languages mean that neither are foreign? For example, my Spanish is pretty bad, even with all its similarities to Arabic. That language I would consider more "foreign" than English or Arabic. Edit: Real talk, I fuckin love this topic. Here's my response lil, by the way. - that a foreign vocabulary takes up the same space as a native vocabulary and that if you hold everything else equal, I'll know more words in my one language than you will in that same language for the simple fact that you have another language taking up space.