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What's the use of a morpheme if it has strong word-formation ability?

* * * Time advantage:

From the perspective of combination, strong word formation ability means high productivity and strong combination ability.

From the perspective of aggregation, compared with other morphemes in synonymous field, it is used more frequently.

Diachronic advantage:

From the combination point of view, the combination ability is relatively stable, and it is not easy to change the grammatical features.

From the perspective of aggregation, compared with other morphemes in synonymous field, lexical meaning and grammatical meaning are more stable and can exist for a longer time.