Quote:
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Does this conversation seem familiar?
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Here,
conversation is a noun and
this is modifying it, not replacing it. It is telling you which conversation, but not substituting the noun, so it's an adjective.
Quote:
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Isn't that the right road?
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Here,
that is replacing a word- the full version would be 'Isn't that road the right road/one?'. As it's replacing a noun, it's a pronoun.
Does that help?