English has currently been spoken all over the world, which substantially influences its development. In Bangladesh, English is studied and increasingly spoken on daily basis by some people and it has emerged as a noticeable variety not necessarily in conformity with either British English or American English. It is a matter of regret that most of the secondary level students in our country are out of the touch of developing speaking skill in English. As a result, errors remain in spoken English. Most of the cases, errors are found in pronunciation and grammar which are the integral and integrated part of second or foreign language since it directly affects the speaker’s communicative competence as well as performance.This research monograph reviews errors on phonological and grammatical aspects of spoken English with theoretical background and procedures of error analysis.It empirically through qualitative and quantitative method finds out the errors & reasons in pronunciation, articles, auxiliaries and prepositions. Finally, it provides some recommendations for effective remedial measures for developing spoken English in the light of the theoretical and empirical findings.