The phrase "was in" can be substituted with a variety of synonyms depending on the context. For instance, one could use the words "occupied," "resided," or "dwelt" when referring to a location where someone lived. If you are discussing someone's participation in a particular activity or event, then phrases like "took part in," "participated in," or "was involved in" can be suitable synonyms. Alternatively, when describing someone's mood or emotional state, you might use terms like "felt," "experienced," or "underwent." In summary, when trying to find a substitute for "was in," consider the context and the specific connotation you want to convey.