The Comparative
When comparing two objects or activities we often add -er to the adjective + “than”, e.g. higher than.
The Superlative
When comparing one with many the order is: the + adjective + -est, e.g. the highest.
Most / The Most
We use “more” and “the most” when the adjective has many syllables, e.g. more difficult than (comparative), the most difficult (superlative).
Example: fat – fatter – (the) fattest.
lazy – lazier – (the) laziest.
Submitted by Jozua van der Lugt. Teacher at EC Cape Town.
Link: How to Form Comparatives