Just some short videos to refresh you something about phonetics
https://www.youtube.com/watch?v=QxQUapA-2w4 , don't forget to go to minute 7,30 and onwards to learn about the most common vowel sound, the schwa.
- Now if you want to improve your pronunciation, it is really important to control the stress and rhythm of your speech. Here you have a tutorial about it, in American English.
