Being an engineer, it is better to pursue the career in the same field, and attend to your English passion. But if you are passionate about teaching English, then you can choose to study certificate courses in English teaching through distance education. But see that you take care of your job too. Getting a job in MNC is not a joke, you have got through after many hurdles. There are many on-line courses that offers certificate courses in teaching English. Many courses such as professional certificate course in English language teaching are internationally recognized. You can teach to individuals in companies, corporate sectors, English training centers. You can also enroll in colleges to provides soft skills training programs for professionals, write content for magazines, papers etc. Once you hold a teaching certificate in English you can choose to become lecture by written the net examinations. You will also qualify for B.Ed training program in English with one more optional subject mathematics/science and teach in schools, colleges and professional colleges where English is also imparted as a study subject in varied courses such as management courses.