Wow, my brain rejects all notions of a 3rd language. When I try and remember my high school French all that comes out is Japanese.
At the start of the 2000s I was seconded to the Asia Pacific division of the company I worked for and, after a year in Sydney I then spent eight months in Tokyo and nearly three years in Taipei.He's 19 and only been with us 9 months. Obviously you must have become fluent in your second language in a fraction of that time. Maybe you could offer us up some insights as to how you did it?
My Japanese, despite working with translators in a Japanese office and having lessons once a week, was still terrible at eight months and I can't really remember much now other than greetings, how to say my name, order some basic food and some beers. Even counting, thanks to the difference between saying the numbers one to ten, and counting ten things. I think I can get to juu on one and get stuck at yottsu on the other.
Then I learned Mandarin. After three years that was ok ish. Again kitchen and taxi Chinese to speak but I was understanding things at work at least.
Towards the end of our stay we took a trip back to Europe to see family and rounded it off with a back packing tour of Italy. This left my brain completely FANDANGOED. I thanked waitresses in Chinese in two separate restaurants and managed a "konbanwa" to a puzzled looking hotel receptionist. Food was ok given the number of Italian places I'd eaten at in England but when it came to money to pay for it my brain was adding it up in English but wanting to say it in French.
I'm incredibly impressed with anyone who can learn one additional language. More than one melts my brain. And knowing bits and pieces of four languages is a recipe for disaster.