How to install half pieces when doing subway tiles
If you're asking about inside corners, yes. You simply lap the two walls. Normally you'd put the grout line on the wall that is parallel to the most common viewing angle so it's less conspicuous. I tend to use slightly smaller grout lines in that situation to conceal them even more. 

If you have any reason to believe you'll get movement at the corner, use caulk instead of grout there.