On my Surface Pro 3, I have three languages installed for my keyboard. I usually use English, but unfortunately it keeps switching while I work. Changing it back to English is easy, but it keeps switching to those other languages I have installed at random times. I'm using a type cover keyboard, and I don't know what I pressed that caused the switches, but it's getting annoying. How can I prevent this from happening at random times? Am I just making it happen myself because I accidentally press the keys that switch languages? Exactly which keys on the keyboard am I supposed to press to change the language?