1.1 Gilakjani, A, P. (2012) Said that “Pronunciation is important. Learners with good English pronunciation are likely to communication with bad pronunciation will not be understood be understood even if they make errors in other areas, wherea, even if their grammar is perfect.”
1.2 According to AUA (online). "Pronunciation is important for effective communication. The sounds of words change when we speak naturally because we use stress and intonation for meaning. To be a successful speaker you need to understand and use stress and intonation."