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Its because of their native language are different.another reason is because People speak English in different ways and accents.speeds too.over the years correct Enlish language level is reduced by word and signs.its because world is fast to make things quick and easy.So for a student to learn the right English Lecture himself must know it correctly to pass it on to the next generation.Lectureres are just mindful of passing the exam and go ahead.not willing to learn the right thing and pass the same to others because they are jealoius
