This study was initiated by the observation of some students who mispronounce some English words e.g. /b/ and
/p/, /s/ and /θ/, /z/ and /ð/.
Finally, we
can conclude that such pronunciation errors are related to factors such as the inconsistency of many English sounds
on the one hand: on the other hand the sound system differences, which have phonological basis (depend on
variation in speech organ positions or breath control.