acestui

In a sentence

• Cheia acestui dulap este stricată.

  The key to this cabinet is broken.

  Here, 'acestui' is a genitive or dative singular masculine/neuter demonstrative pronoun referring to 'dulap' (cabinet), which it directly modifies in the phrase, indicating possession.

• Datorită acestui fapt, am întârziat.

  Because of this fact, I was late.

  In this case, 'acestui' is a genitive singular masculine demonstrative pronoun referring to 'fapt' (fact), signifying causality within the context of the sentence.

• I-am dat florile acestui băiat.

  I gave the flowers to this boy.

  Here, 'acestui' is a dative singular masculine demonstrative pronoun referring to 'băiat' (boy), functioning as an indirect object indicating the recipient of the action.