壹線口語e2say

before，above，behind，ahead of和in front of的區別如下：

in front of :在...前面 (相對靜止的概念)

before :在...前面 (+詞、句子、壹般和時間相連)

ahead of :在...前面 (+時間、位置)(動態的行為)

above強調位置,在.上面（懸空於上方）,

behind強調位置,在.後面,

He arrived before six o'clock.

He goes ahead of me.