acostant

In a sentence

• Estàvem acostant-nos al cim de la muntanya.

  We were approaching the mountain's summit.

  Here 'acostant-nos' is a reflexive verb form indicating 'getting closer'.

• Està acostant-se al final del llibre.

  He is approaching the end of the book.

  In this case, 'acostant-se' is showing progression towards a conclusion.

• Acostant la cadira a la taula, va descobrir que hi havia un paper sota.

  Upon moving the chair closer to the table, he discovered a paper underneath.

  Here 'acostant' implies actively moving an object closer.