They were our new neighbors. It was my cat. I was at the Lan House yesterday. You were my best friend. He was a doctor.
Para passar frases no presente para o passado, troque o verbo to be (am, is, are...) por um dos dois verbos na forma passada (dependendo do sujeito) was e were, e se for necessário, troque a expressão de tempo (today, now) por uma que indique passado (yesterday, last week).