"I eat an apple."
What you wrote is closer to "an apple eats me", but you have not conjugated "ith" to "itheann" correctly.
You need to use Verb-Subject-Object in Irish. So here, "mé", or "I" is the subject doing the action, and "an úll", or "the apple" is geting eaten, so it is "ithim (ith + mé) an úll".
I hope that helps.
I wrote "Ithim mé úll." I got it incorrect. I see that Matson had "I" as the object of the sentence, thus meaning he was the one being devoured by the apple. However, "I" is in the subject part of the sentence in mine, but I got it wrong. Could you explain? Thank you in advance! :D
Itheann mé is used mainly in Ulster Irish. This course teaches the Caighdeán (“standard”) form, which uses the synthetic (i.e. combined) form ithim, whether an object is present or not. That being stated, it would be reasonable to have itheann mé accepted for the benefit of those who would like to learn Ulster Irish.