Code-switching and code-mixing are effective communicative tactics used by ESL bilingual teachers to teach English as a secondlanguage to non-native English learners.Code-switching is a prolific strategy of teaching English to the students, especially to the learners of higher classes.This research study is an effort to explore teachers’ and students’ attitude towards code alternation within English language classrooms in Pakistan. In Pakistan where the official language is English, the national language is Urdu, and every province has its own language, most of the people are bilingual or multilingual. Therefore, the fundamental aim and objective of this study is to find out when and why teachers code switch in L2 English classrooms. It has also explored students’ preferences of language while learning a second language as well as teachers’ code mixing and code-switching patterns in the class. Random sampling was used for this specific study.It included English language teachers and students of graduate classes.Questionnaires were used for measuring effectiveness of code-switching strategy on the target population.Research paradigm of this study paper is quantitative.15 English language teachersresponded to an open ended questionnaire and 160 students responded to a close ended questionnaire.

Code mixing, Code switching, second language, National language, Teachers’ approach