these be books中be的用法正确吗一般疑问句怎么改告诉我吧很急

These---(be)his English books these be books中be的用法正确吗一般疑问句怎么改告诉我吧很急 these books can be o_____ online. These be his books的正确形式 这些书中没有一本是有用的.填什么?（ ）（ ）（ ）these books can be useful all these books need to be packed into the boxes为什么要用be These are ()() my books. Are these books ( )(your)? These books are _____. 变一般疑问句!They can take these books to be classroom 变否定句!They can take these books to be classroom please retn these books tomorrow .other people may be waiting to borrow the them 翻译 What's these?They_____(be)the books that I_____(buy)last week. 用be的合适形适填空These books ______in the backpack. If you come,you will be the first choice these books,这句话有语法错误吗? 用be的适当形式填空：These books in the backpack This his watch .It white 用be的合适形适填空These books ________.It ______white. These a___ my English books.