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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. We normally use this, that, these and those as pronouns to refer to things or ideas:. These metals are effective but costly and limited in supply. These phases can strongly influence how well the material performs as a catalyst. 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. You use these to refer to people or things that are near you, especially when you touch them or point to them. I put these pictures up here to show how children are solving the problem..