The purpose of this study was designed to examine the impacts of mother tongue (Afan Oromo)rnand other school related factors on students learning ability in Engli sh language and to forwardrnthe finding with possible recommendations to concerned stakeholders so that they would takernmeasures in improving at various levels.rnA descriptive survey method was employed. The sample consisted of 200 students, ten Englishrnteachers and three school principals draw from three sample high schools in Arsi Zone.rnRegarding the respondents, students from each sample school were selected using stratifiedrnrandom sampling. But the principals, Engli sh teachers were se lected using available sampling.rnTo gather the necessary data questionnaire (open and closed ended), interviews and observationrnwere the main instruments employed. The information gathered through questionnaire andrnobservation was analyzed in percentage whilst the information collected through interviews andrnopen-ended questions were analyzed qualitatively.rnThe major findings of the study include the vowel length and consonant geminations of certainrnsounds in the written form of Afan Oromo confuse to a certain extent the English learner. Thernlevel of teachers ' qualification and teaching experience were adequate to teach English at gradernlevel except two teachers "vho "Ycrc diploma holders. School instructional resources wererninadequate. The overcrowded nature of the classroom was also another findin g. Students'rnreadiness for learning Engl ish which is through students' motivation was appropriate. Forrnvarious reasons, the ability of the students in English currently low.rnBased on the findings recommendations are made to existing problems. Accordingly, Qube hadrnbetter revised to minimize sound confusion to learn English and lengthing of vowels andrngemination of consonants, devising mechanism to improve the quality of English teachers,rnencouraging private investors to open private high schools, employing different methods ofrnteaching English, encouraging students to improve Engli sh language and others werernrecommended to solve the identified problems.