Correct the mistakes in the second sentence

2. His flat is very big.
3. I bought a new shirt.
4. She’s a girlfriend of Ryan.
5. We go on holiday in August.
6. She is always late.
7. I can’t sing.
8. I’m waiting for him.
9. We don’t mind to clean.
10. There aren’t any plants.
11. There were a lot of guests.
12. They don’t eat any sugar.
13. I’m much older than you.
14. They’re the most dangerous animals.
15. She speaks good german.
16. She’s an engineer.