Add -er for the comparative and -st for the superlative.
Use the comparative with dan (dieper dan…) and the superlative with het (het diepste).
The comparative (vergrotende trap) of diep is dieper. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...dieper dan...
The superlative (overtreffende trap) of diep is diepst, usually used as het diepste.
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