I've often asked myself that same question. In my opinion, it should not, but it probably depends on whose book you like. As is sometimes pointed out, we don't have an official "government" czar of AmE/BrE grammar.
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stuartgregIf a present or past participle is being used adjectively, can it strictly (if we are using precise grammatical terminology) be called an adjective?Yes. You use the word "participle" if you want to call attention to the word's origin in a verb.
CalifJim I would not hesitate to call the underlined words adjectives.
I'd like to read an interesting book tonight.
There was a broken cup on the table.
The children seemed to enjoy telling frightening stories.
Thank goodness they've found my lost keys. Hi, Jim,
These four words have separate main headings as adjectiv