1. Joe is a badder student than Mia.

→ Joe studies worse than Mia.

2. Mia is fater that Joe.

→ Mia is fatter than Joe.

3. Joe isn't older that Mia.

→ Joe isn't older than Mia.

4. Joe is moderner than Mia.

→ Joe is more morden than Mia.

5. Mia is friendlyer than Joe.

→ Mia is friendlier than Joe.

6. Mia is more nice than Joe.

→ Mia is nicer than Joe.

7. Joe is gooder football than Mia.

→ Joe is better at football than Mia.

8. Joe's pants are shorter Mia's

→ Joe's pants are shoter than Mia's.

9. English is difficulter than French.

→ English is more difficult than French.

10. Mia is a dancer better than Joe.

→ Mia is a better dancer than Joe.

1. badder → worse

2. fater → fatter

3. that → than

4. moderner → more modern

5. friendlyer →  more friendly 

6. more nice → nicer

7. gooder → better

8. shorter → shorter than

9. difficulter → more difficult

10. a dancer better → a better dancer