Add -er for the comparative and -st for the superlative.
Use the comparative with dan (opener dan…) and the superlative with het (het openste).
The comparative (vergrotende trap) of open is opener. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...opener dan...
The superlative (overtreffende trap) of open is openst, usually used as het openste.
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