The phrase "are in" can be replaced with several synonyms to enhance the language used in communication. Some of the common alternatives for "are in" include "arrived," "entered," "settled," "occupied," and "present." These synonyms provide a variety of options to describe a situation where someone or something is currently situated. For instance, instead of saying "the guests are in the sitting room," you may opt for "the guests have arrived in the sitting room." The use of synonyms can help to avoid repetition in language, and also demonstrates a wider vocabulary range, which can enable better communication with the audience.