We show how to build up a systematic bosonic field theory for a general rea
ction-diffusion process involving hard-core particles in arbitrary dimensio
n. We discuss a recent approach proposed by Park, Kim, and Park [Phys. Rev.
E 62, 7642 (2000)]. As a test bench for our method, we show how to recover
the equivalence between asymmetric diffusion of excluding particles and th
e noisy Burgers equation.