HI, Jameshe In front of (opposite behind or in back ) is used when one thing is separate from the other: A boy ran out in front of the bus At/in the front of (opposite at/in the back of ) is used when one thing is inside or a part of the other" The boy took a seat at/in the front of the bus. I hope my reply was useful to you
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.