In Reply to: F v P posted by roy_m on Thursday, 26. April 2012 at 05:26 Bali Time:
as you say as Indonesian people learning English are unable to make the sound f as english speakers do as they have no equivalence in their language and their mouth and tongues are not capable of making the shapes required. It is similiar for french speaking people trying to say the sound th. It takes a lot of practice but as they have trouble even hearing the sound its a long road.