Here are the corrections for each sentence:

1. I find **carve eggshell** boring because it takes a lot of time to complete **one shell.**
- Correction: **carving eggshells**; **one shell.**

2. My brother **does** not go to class to learn how to paint.
- Correction: **does**; **goes**

3. I took up this hobby after I came back home from the Arts Gallery.
- Correction: **take**

4. I think playing volleyball **is** interesting because it is a team game.
- Correction: **interest**; **is**

5. In my opinion, more people **will play** Monopoly in the future.
- Correction: **played**; **will play**