Add -er for the comparative and -st for the superlative.
Use the comparative with dan (wijzer dan…) and the superlative with het (het wijste).
The comparative (vergrotende trap) of wijs is wijzer. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...wijzer dan...
The superlative (overtreffende trap) of wijs is wijst, usually used as het wijste.
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