One of the tools we can make use of when learning a foreign language is a pronouncing dictionary. In the latest edition of the Longman Pronunciation Dictionary (LPD), authored by J. C. Wells, we can find a number of relevant facts about the (changing) pronunciation of English. Below is a link to a video where Prof. Wells explains how a number of words are pronounced. After watching the video, comment on what you've found most interesting. Do you think it is worth learning about these things?
Dr. Wells about preference polls in LPD