There is a nice cat in the tree.改为复数形式

This is my book.(改为复数形式) There is a nice cat in the tree.(改为 There is a nice cat in the tree.改为复数形式 This is my book.改为复数形式 There is a nice cat in the tree.改为复数形 there is a bird in the tree变为复数形式 There is a balloon in the tree 改为复数句 There is a tree in the garden.改为复数句 请完成这些句型转换This is my book.(改为负数形式）There is a nice cat in the There is a cat on the tree.(复数) IS there a cat in the tree这句话改成复数句是什么? There is a knife in the kitchen.(改为复数形式) there is a watch in the box改为复数形式 There is a child in the classroom.改为复数形式