1. They can sing. (用dance 将句子变成选择疑问句) ________ they sing ________ dance? 2. What's your age? (改为同义句) ________ ________ are you? 3. You can come here again. (改为祈使句) ________ ________ again, please. 4. Can Kate draw a picture? (作肯定回答) ________, ________ ________. 5. We can play ping-pong. (改为否定句) We ________ ________ ping-pong.