Add -er for the comparative and -st for the superlative.
Use the comparative with dan (blijer dan…) and the superlative with het (het blijste).
The comparative (vergrotende trap) of blij is blijer. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...blijer dan...
The superlative (overtreffende trap) of blij is blijst, usually used as het blijste.
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