Almost all English Learners say "I don't need to Study Pronunciation. I just want to Communicate in English." Many of them think that they can Communicate in English because they can Communicate with their teacher and other students. Do not make this mistake!.
Your Pronunciation creates the first impression you make. In America most people could not understand the foreigner because he had bad Pronunciation even if his grammar is good.but after he has been in America for only two years he has excellent Pronunciation.If you want to Speak English well enough, you must work on your Pronunciation.