Answer:
1. Informal - Contractions/First-person pronouns
2. Informal - Contractions/First-person pronouns
3. Informal - Phrasal verbs (going to)
4. Formal
5. Informal - Contractions/First-person pronouns
6. Informal - Contractions/First-person pronouns
7. Informal - First-person pronouns
8. Informal- First-person pronouns
9. Formal
10. Informal - Slang
I hope this helps :)