adjectives comparative and superlative

if the adjectives “large” comparative from large is?

if the adjectives “close” Superlative from close is?

if the adjectives “cheap” Superlative from cheap is?

if the adjectives “old” Comparative from old is?

the comparative from clever is?

the Comparative from “thick” is?

if the adjectives is slow then comparative is slower,so superlative is?