Tom's doctor referred him to a cardiologist. ✬

Who referred you? ✬

Tom referred to his notes. ✬

Tom referred to the map. ✬

Tom was the one who referred Mary to us. ✬

Tom got angry when Mary referred to his friend in that tone. ✬

Tom is the one who referred Mary to us. ✬

Tom is the one that referred Mary to us. ✬