Add -er for the comparative and -st for the superlative.
Use the comparative with dan (echter dan…) and the superlative with het (het echtste).
The comparative (vergrotende trap) of echt is echter. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...echter dan...
The superlative (overtreffende trap) of echt is echtst, usually used as het echtste.
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