- й = The "y" sound in "yes"
- и = The "é" sound in "compré"(Spanish)
- і = The "ee" sound in "wheel"
Given that, Ukrainian mixes two vowels into some letters. One of them is the ї, which represents [ й + і ].
You may listen to it on http://forvo.com/languages/uk/. Just find there some words with these letters. For exemple:
Also you may read here: