We use "this" / "that" / "those" / "the ones" as demonstrative adjectives and pronouns to become aware of the factor or matters we're speakme approximately.
Demonstrative adjectives:
I like this e book.
That book is highly-priced.
She loves those books.
I want the ones books.
Demonstrative pronouns:
Whose e book is this?
That is my e book.
These are mine.
I want those, now not the ones.
What is Adjective?
A word belonging to one of the important form instructions in any of severe languages and typically serving as a modifier of a noun to indicate a pleasant of the aspect named, to indicate its quantity or quantity, or to specify a thing as wonderful from some thing else.
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