16. more hotter -> hotter
17. badder -> worse
18. boring comedy a -> a boring comedy
19. most long -> longest
20. convenient -> more convenient

11. a --> than
12. tallest ---> the tallest
13. least ---> leaster
14. a service perfect ---> a perfect service 
15. the most lucky --> the luckiest
16. more hotter --> hotter
17. badder --> worse
18. boring comedy a --> a boring comedy
19. the most long --> the longest
20. convenient --> more convenient

11. a bus -> than bus
12. tallest -> the tallest
13. least -> less
14. service perfect -> perfect service
15. most lucky -> luckiest
16. more hotter -> hotter
17. badder -> worse
18. boring comedy a -> a boring comedy
19. most long -> longest
20. convenient -> more convenient

11.))
a bus -> than a bus
12.))
tallest -> the tallest
13.))
least -> the least
14.))
a service perfect -> a perfect service
15.))
most lucky -> luckiest