Add -er for the comparative and -st for the superlative.
Use the comparative with dan (armer dan…) and the superlative with het (het armste).
The comparative (vergrotende trap) of arm is armer. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...armer dan...
The superlative (overtreffende trap) of arm is armst, usually used as het armste.
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