按要求完成句子。 1. We start school at eight o'clock. (改为否定句) We _____ _____ school at eight o'clock. 2. They have lunch at school. (改为一般疑问句, 并作肯定回答) _____ they _____ lunch at school? _____, they _____. 3. I have three lessons in the afternoon. (改为一般疑问句,并作否定回答) _____ you _____ three lessons in the afternoon? _____, I _____. 4. I go home at five o'clock . (对划线部分提问) _____ _____ _____ you go home?