Is that a bus?复数形式

Is that a bus?复数形式 That is a red bus.变复数形式. is it a bus改为复数形式 This is a bus. That is a sheep.的复数形式 that is an orage bus 改为复数形式 is/am this that ciass bus的复数形式 that is a bus.(变为复数句）that is a bus.(变为复数句） This is a bus.改为复数形式的句子 There is a bus under the tree.复数形式 that is a jacket 变复数形式 that is a nice photo 复数形式 Is that a book改为复数形式 Is that a photo?的复数形式 Is that a basketball?改为复数形式 Is that a bus?(改为复数句） 改成复数形式．1．Is that a bus?2.What's thia?It's a box.3.Where is the pen?It's in the desk. That is a new shirt 改为复数形式 What is that?itis a pen改为复数形式