Teacher in front of blackboard 的in front of 可以换成before么

in front of 强调位置上在...之前,before 强调时间上在...之
不可以的
at or in the front
[同] in front,ahead,before
[例]
I see the lights of a town ahead
the road ahead is foggy
staring straight ahead
we couldn't see over the heads of the people in front
with the cross of Jesus marching on before

不能换。 before是时间上的

最好不要换，in front of 强调位置上在...之前，before 强调时间上在...之前。