There is a dog behind the tree.用cat改为选择疑问句

There is a dog behind the tree.用cat改为选择疑问句 There's dog behind the tree,用cat改为选择疑问句 There is a cat behind the chair.怎么改为一般疑问句 cat,tree,a,there,the,is,behind(连词成句） 用a is cat behind cuetains there the(?）造句 There is a boy under the tree,怎样改为疑问句 This is my book.(改为复数形式) There is a nice cat in the tree.(改为 翻译The cat took refuge from the dog behind a tree. There is a tree behind the house ,____________?改反意疑问句 急,快昂! The cat is behind the door 是否和 There is a cat behind the doo 用介词填空 There is a dog sitting -----the tree. Is there a big tree behind the house?(改为否定式的陈述句）