Do you think primarily in English?
tel: In my experience I think in English 90% of the time. When working problems requiring a lot of spatial insight, I pretty easily switch to something more visual and visceral. This also happens when I'm drawing and sometimes when I'm playing music.I'm also learning Chinese. It is anything but an easy language to learn, I'll say, and I don't feel like I'll be thinking fluently in it anytime soon. That being said, if I concentrate and force myself to think in Chinese I can get by with a huge hit to rate of thought. It's something I practice from time to time despite the frustration.