in front of in the front of at the front of 区别

in front of“在…的前面”,指某一范围以外的前面.
at/in the front of…“在…的前面”,指某一范围以内的前面.
例如：Miss Gao is standing at the front of the classroom.
高小姐站在教室的前面.（指某一范围内的前面）
There is a tall tree in front of the house.
房子前面有一棵大树.（指某一范围以外的前面）
Put your hands in front of you now.
现在把你们的手放在你们的前面.（指某一范围以外的前面）
Let's sit in the front of the bus.
我们坐在公共汽车的前部.（指某一范围内的前面）
另外,in front只笼统地表示“在前面”,而不是某物的前面,因此后面不跟其他名词.例如：
Which two classes are in front?
哪两节课在前面?
I'll go in front; you come after.
我在前面走,你在后面跟上.

How can get to there?