Vowel pronunciation rule
I'm watching the pronunciation guide for the vowels on Learn Gaelic, one thing I'm stuck on is he E. There's three pronunciation for the lower E. "Eh" in dheth and the "a" sound in le. On top of that there's the "uh" sound in caite because it's at the end of the word, that makes sense. What then is the rule for when to use "eh" or "a" when it's not at the end of the word?
I'm well into Unit 2 on duolingo now after starting about 40 days ago, but my lack of understanding of the alphabet is really holding me back now so taking a step back to really try nail it.