Correct the 20 grammar mistakes below.

1. 'like' should be 'likes' (already corrected). 2. 'wake' should be 'wakes'. 3. 'brush' should be 'brushes'. 4. 'go' should be 'goes'. 5. 'think' should be 'thinks'. 6. 'do' should be 'does'. 7. 'arrive' should be 'arrives'. 8. 'has' should be 'have'. 9. 'is' should be 'are'. 10. 'love' should be 'loves'. 11. 'he' should be 'him'. 12. 'at' should be 'in'. 13. 'in addition' should be 'Additionally'. 14. 'finally' should be 'Finally'. 15. 'for fun' should be 'For fun,'. 16. 'in the morning' should be 'In the morning,'. 17. 'in the evening' should be 'In the evening,'. 18. 'to' should be 'for'. 19. 'go downstairs' should be 'goes downstairs'. 20. 'a while' should be 'a bit' (optional).