1. What language is your native tongue, and were you lucky to be raised in a bilingual household?
English (American) is the language that I speak. And I don't think I was raised in a bilingual household.
2. What other languages do you know other than your first language? If you care to explain, when and why did you learn them?
Spanish (Learned it in junior high and kept on learning it until college ... can say a few words and phrases but haven't used it much.)
3. Which language do you use most frequently, and which language do you prefer the most?
I use English most commonly and I prefer English.
4. What would you think of your vocabulary level? What is probably the most complex word you use on a daily basis?
I think it is basic. Something I do use big words but I don't like to overcomplicate things.
5. How's your handwriting? Is it legible, or do you think it's too sloppy?
It isn't that bad and it isn't that good. It has come a long way from when I was younger.
6. Do you happen to be a Grammar Nazi? Or are you fairly lenient on the grammar of others?
I don't correct people ... well I think I don't correct people ... I am not quite certain. (Yes, people do use incorrect grammar from time to times but I think it is a little rude to correct them. Maybe send them a hint but I am might be still wrong. Like I said I am not 100 percent certain. Last, I am at fault of using bad grammar but people rarely notice.
I was not clever to notice that your title of the post meant One Common Language. But that's okay with me.