4. Read the short news story. There are four mistakes in the use of the Past Continuous tense. Find the mistakes, correct them, and rewrite the sentences. The Lucky Find "Last Tuesday, John Miller was walk in the park. He was listened to music on his headphones. While he was sitting on a bench, he was noticing a small, shiny object under the seat. At that moment, his phone was ringing. It was his friend. Later, they discovered it was a rare, valuable coin!"