A. We use comparative adjectives to describe people and things.
A1. We use than when we want to compare one thing with another.
A2. When we want to describe how something or someone changes we can use two comparatives with and.
A3. We often use the with comparative adjectives to show that one thing depends on another.
B. After comparatives you can use than
B1. Comparative form is ‘-er’ or ‘more ~’
B2. use ‘-er’: cheap -> cheaper, thin -> thinner, pretty -> prettier (-y -> ier for two-syllable word)
B3. use ‘more’ for two syllable or more: more often, use more for adverbs that end in -ly: more seriously
B4. can use ‘-er’ or ‘more’ with some two-syllable adjectives: clever, narrow, quiet, shallow, simple
C. god/well -> better, bad/ badly -> worse, far -> further or farther, further also ‘more’ or ‘additional’