before与behind的区别
In front of和behind主要用来指空间上的方位。
比如：The river is in front of his house. (河在他的房子的前面) An oak tree is behind her garden.（一棵橡树在她的花园后面） 但是before和after却主要用来指时间上的前后. 比如：I came into the office before him. (我在他之前来的办公室) She arrived here just several minutes after me. (她是在我之后几分钟到这里的)