1. Where is my backpack? 我的背包在哪儿?
It’s in the room / under the bed / on the bookcase.
Where are the books? 那些书在哪儿?
They’ar on the desk / under the bed / on the bookcase.
总结:where is/are ......?是由 主语 决定is 或are的。
同时对 方位 提问用 where 。
例如: The books are on the desk. (提问) Where are the books?
2. It’s / They’re in the drawer / under the bed / on the bookcase.
它 / 它们在抽屉里 / 床底下 / 书柜上。 (注意主语和be动词照应)
3. Is it / Is the book on the bed / in the backpack / under the desk?
它 / 这本书 / 它们在床上 / 背包里 / 桌子下吗?
Yes, it is. / No, it isn't.
Are they on the bed / in the backpack / under the desk?
Yes, they are./ No,they aren't.