Here’s the completed table:

| Adj | Comparative | Superlative | Adj/ Adv | Comparative | Superlative |
|-------------|--------------|-------------------|----------|------------------|---------------------|
| tall | taller | the tallest | friendly | friendlier | the friendliest |
| easy | easier | the easiest | quickly | more quickly | the most quickly |
| thin | thinner | the thinnest | slowly | more slowly | the most slowly |
| quick | quicker | the quickest | good | better | the best |
| large | larger | the largest | bad | worse | the worst |
| important | more important| the most important| much | more | the most |
| difficult | more difficult| the most difficult| little | less | the least |
| happy | happier | the happiest | | | |
| | | | | | |
| old | older | the oldest | | | |

Feel free to ask if you need further assistance!