Adjectives ending in -r add -der (not -rer) in the comparative.
Use the comparative with dan (zuurder dan…) and the superlative with het (het zuurste).
The comparative (vergrotende trap) of zuur is zuurder. Adjectives ending in -r add -der (not -rer) in the comparative. Use it with 'dan': ...zuurder dan...
The superlative (overtreffende trap) of zuur is zuurst, usually used as het zuurste.
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