1. His ruler is in the box. (对画线部分提问) ___ ____ his ruler? 2. This room is Lucy and Lily's. (改为选择疑问句) _ _ this room Lucy's ____ Lily's? 3. Is he your friend? (改为复数) ___ ____ your ____? 4. These are our apples. (改为单数) ___ is ____ ____. 5. The boy is all right today. (对画线部分提问) ___ ____ the boy today? 6. They can see a bird in the tree. (对画线部分提问) ___ ____ ____ see in the tree?