There is no basic rule for these endings.
However, if there is a corresponding noun ending in ation, the adjective ending is usually able or ative:
- affirmation/affirmative
- duration/durable
- information/informative
If the corresponding noun ends in sion or tion not preceded by a, the adjective ending is usually ible or itive:
- competition/competitive
- division/divisible
- reproduction/reproducible
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