Q. One who does not read Hebrew and cannot follow along in a Chumash, etc. during Megillah – what is he to do? The mind wanders, and one is not yotzi!?
Or is one still yotzi even if he daydreams.
A.   Horav Shlomo Miller’s Shlit’a opinion is that he should try to follow the reading using a translation that he understands. Since he is after all listening to the Hebrew and at the same time following with the translation he would comply.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a