

Terminology differs from book to book, so without knowing the approach of the entire book you are working from, it's difficult to sort this out for you. Nevertheless, you might find this way of looking at it useful: Determiners are the articles ( a, an, the ), possessive phrases ( my, his, John's, the president's ), demonstratives ( this, that, these, those ), and a few others like all and some . Some books call determiners adjectives, or 'limiting adjectives' I believe your book is doing this.
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