Add -er for the comparative and -st for the superlative.
Use the comparative with dan (langer dan…) and the superlative with het (het langste).
The comparative (vergrotende trap) of lang is langer. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...langer dan...
The superlative (overtreffende trap) of lang is langst, usually used as het langste.
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