第四课时按要求完成句子。1. The computer is on the desk. (对画线部分提问)_ _ the computer?2. The city is small. (用ten years ago改为一般过去时)The city _ small ten years ago.3. They were at school yesterday. (改为否定句)_ _ at school yesterday.4. The river was clean five years ago. (改为一般疑问句并作肯定回答)_ the river clean five years ago?_, _ _.5. There was a park last year. (改为一般疑问句并作否定回答)_ _a park last year?_, _ _.答案：1. Where is2. was3. They werent4. Was; Yes, it was 5. Was there; No, there wasnt
