句型转换。 1. Is that a red ruler?(否定回答) _____, _____ _____. 2.That is my good friend.(改为复数句子) _____ _____ our (我们) good . 3. This is her family photo.(变为一般疑问句) her family photo? 4. Helen is Mr Green's daughter.(改为同义句) Mr Green is Helen's . 5. These are orange backpacks.(改为单数句子) orange backpack.