句型转换。 1. Mrs Liu is talking with Xie Ying's mother. (就画线部分提问) ________ is Mrs Liu talking________? With ________ is Mrs Liu ________? 2. I am on duty today. (就画线部分提问) ________ ________ on duty today? 3. That is Sam's apple. (就画线部分提问) ________ apple ________ this? 4. The books are ours . (就画线部分提问) ________ ________the books?