Add -er for the comparative and -st for the superlative.
Use the comparative with dan (koeler dan…) and the superlative with het (het koelste).
The comparative (vergrotende trap) of koel is koeler. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...koeler dan...
The superlative (overtreffende trap) of koel is koelst, usually used as het koelste.
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