The sunglasses are in my bag.中为什么要用are?

The sunglasses are in my bag.中为什么要用are? Are the sunglasses yours?为什么用yours There are some bread in the paper bag.中谓语动词为什么用"are" are the photos-----no,mine are in my bag 翻译 My all the books are in that bag. There are no books in my bag .(用then 改写) 1.Where are my books?They are in ___ bag.用a,an,the 填空并语法说明 2 Where are his keys?用in the bag回答 there are many in the bag there are some rice in the bag some rice are in the bag.【改错】 英语翻译Ruler and pen are in the bag.为什么不用are?