acestea

In a sentence

• Acestea sunt cărțile pe care le-am citit.

  These are the books that I have read.

  In this sentence, 'acestea' is a demonstrative pronoun used to refer to feminine plural nouns in the nominative or accusative case.

• Am discutat cu prietenii mei despre acestea și s-au arătat interesați.

  I talked with my friends about these, and they seemed interested.

  Here, 'acestea' is a demonstrative pronoun in feminine plural form, referencing previous feminine plural entities in a conversation.

• Îmi plac acestea deoarece sunt foarte confortabile.

  I like these because they are very comfortable.

  In this example, 'acestea' is used as a demonstrative pronoun to directly refer to a previously mentioned group of feminine plural items.