Answer and Explanation:
1. he spent 300 years in Tir na nOg, although without realizing it, because the time in Tir na nOg passes differently.
2. she felt immensely sad and disappointed, as she had informed him that he should return to Tir na nOg and warned him not to touch the Irish floor, or his return would be impossible and she wished him to return, as they were in love .
3. When reading the story we can say that Tir na nOg is a magical and mystical land. This is because there is no disease or sadness on this land, and the inhabitants do not age, as time passes too slowly. So everyone can maintain their strength and beauty.
4. She said that he would not be able to return if he set foot on the ground in Ireland, that is, if he returned to reality. This is a great tip, because if he left, he would probably die, due to the life span he had assumed.
5. Probably because she didn't want him to be tempted to test the result of putting his feet on the floor.
6. I believe that living in Tir na nOg would be a punishment, as we would suffer for not seeing our family and not being able to allow them to enjoy the same privileges.