1. I speak English and Cantonese in the main. I took four years of German and I still remember most of it pretty well. I took Latin for two years but I've forgotton everything already except for a few words here and there. Other subjects I took include French, Classical Greek and Latin but I've forgotton most of all that (even though at one stage, Latin was my favourite subject.) I know a few Japanese words and phrases from all the anime I watch and from chinese kanji.

2. I speak Cantonese at home but I wasn't born in China. If your definition of "native" is the language of your nation of birth (in my case, Australia) I guess my native is English too.

3. I think in both Cantonese and English. Depends on what I'm doing.