Learning correct pronunciation has been one of the major challenges for a learner who learns a language either as second language or as foreign language. It is equally difficult for an instructor to make learners learn correct pronunciation. The challenge aggravates both for the learners and for the instructors if the learners are adult or adolescent. The study is an effort to find out the commonly mispronounced English words in Bihar and U.P. It analyzes the mispronounced words and find out the patterns of errors and look into the causes of errors. Furthermore