Exercise : Put the verb in the correct form . 1. When the phone ( ring ) , I ( have ) a bath. 2. You ( wear ) your new hat when I ( meet ) you yesterday . 3. While you ( play ) the piano , I ( write ) a letter . 4. Before you ( mention ) him , I ( hear , never ) of that author . 5. When we ( go ) to see them last night , they ( play ) cards , they ( play ) since six o'clock P/S : Bài này em đã làm rồi nhưng hỏi mọi người thử giống đáp án không !!!