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This and these are used in different ways when you are referring to people, things, situations, events, or periods of time. They can both be determiners or pronouns. This, that, these and those are demonstratives. We use this, that, these and those to point to people and things. This and that are singular. These and those are plural. We use them as determiners and. This, that, these, and those are demonstratives used to point to specific people, things, or ideas. They help show how many things you’re talking about and how far they are from the speaker. Knowing. "In the real world, we're making decisions and solving problems in complex, noisy, dynamic environments. To better mirror human developmental learning, we need to account for these external. This and these are demonstratives, which means they indicate a specific noun in a sentence. The two words are similar because they refer to nouns that are near in space and time. Definition of these in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more....
