I think it's always an adjective in premodification. Do you have a problematic example?
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EnglishGirlWe were thought that both participles and adjectives can be premodificators. e.g.a tried method (tried participle) the running water (running participle)an interesting story (interesting adjective)Premodificators? Do you mean premodifiers?
EnglishGirlI would say that middle-aged as an adjective and Spanish-speaking is a participle.At least we all agree that "Spanish-speaking" is a participle.