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This and those are both demonstrative pronouns, but they are used in different contexts.

This refers to a singular item close to the speaker, while those refers to plural items that are further away or not currently being discussed.

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BLANK is my coffee mug right here on my desk. BLANK are my colleagues standing near the entrance.

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This

--feedback--

Think of a word that refers to a singular item that's close or currently being discussed. The first letter is capitalized.

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Those

--feedback--

This word is used for multiple items or people, especially if they're at a distance. The first letter is capitalized.