When does 给 object come before a verb, and when does it come after?
In general:


  When 给 is placed before a verb, it means 'for'. And it has a 'demanding or asserted tone' to it.


给我打!= Beat (him) for me!

给他送 = give/ send (it) for him

给我证明 = prove (it) for me


  When 给 is placed after a verb, it means 'to'


送给她 = give/send (it) to her

证明给我看 = prove (it) to me