What is the difference between "întotdeauna" and "mereu"?
No difference. :)
The word beau in this sentance is not pronaunced correctly
I always drink apples juice after lunch
Eu was pronounced with trailing 'm' sound.
Why are some adverbs before the verb and some after? Is there a rule?
No. Placing the adverb in front of the verb emphasizes a bit the statement.