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These metals are effective but costly and limited in supply. These phases can strongly influence how well the material performs as a catalyst.

1 day ago · What is the difference between this and these? 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 …

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 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.

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. These scissors are …

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 …