Yes, there are four demonstrative adjectives in English. They are “this,” “that,” “these,” and “those.”
No, demonstrative adjectives are used only with concrete nouns that can be seen, touched, or pointed to.
Use “this” and “these” for things that are near, and “that” and “those” for things that are far away. Also, use the singular forms of “this” and “that” for singular nouns, and plural forms of “these” and “those” for plural nouns.
No, demonstrative adjectives are used only to modify a noun or pronoun and cannot function as a subject or object in a sentence.