Add -er for the comparative and -st for the superlative.
Use the comparative with dan (ruwer dan…) and the superlative with het (het ruwste).
The comparative (vergrotende trap) of ruw is ruwer. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...ruwer dan...
The superlative (overtreffende trap) of ruw is ruwst, usually used as het ruwste.
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