Add -er for the comparative and -st for the superlative.
Use the comparative with dan (ronder dan…) and the superlative with het (het rondste).
The comparative (vergrotende trap) of rond is ronder. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...ronder dan...
The superlative (overtreffende trap) of rond is rondst, usually used as het rondste.
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