To find out the problems of pronunciation on letter /p/ and /b/ sound in the 2 year
English for International Communication students at Rajamangala University of Technology
Isan, Surin Campus. The participants in this study were 30 students. The research instrument
used in this study was a test. The participants were given the test then listening from sound
test and the participants circled the correct word that they have heard. The results obtained
from the analysis indicated that the majority of participants have problem of /b/ pronunciation
rather that /p/ pronunciation.