Correct the mistake in the second sentence ​

2. his flat is very big

3. I bought a new shirt

4. she's Ryan's girlfriend

5. we go in holiday in August

6. she is always late

7. I can't sing

8. I'm waiting for him

9. we don't mind cleaning

10. there aren't any plants

11. there were a lot of guests

12. they don't eat much sugar

13. I'm older than you

14. they're the most dangerous animals

15. she speaks German well

16. she's an engineer