Non-adjectives that have a comparative and superlative form 1
Formation of the comparative
Forming the comparative is easy. As in English, the suffix -er is added to the bare adjective:
Remember to follow the spelling rules when adding the suffix –er: You might have to lose a vowel (groot – groter) or double a consonant (dun – dunner).
Some adjectives do not get the suffix –er to form the comparative, but the suffix –der. This happens only when the last sound of an adjective is /r/:
There is one adjective with an irregular comparative which has to be learnt by heart: