Tony's trousers are worn out,buy him another pair为什么是pair 而不是another one

Tony's trousers are worn out,buy him another pair为什么是pair 而不是another one tony's trousers are ---his brother's.they have the same color and size.A.the same B.the same toC.similar to 用英文翻译：那条裤子是托尼的 That ___ ___ trousers ___ Tony's. These are Jim's trousers.____trousers are these? They are Tom＇s trousers.对Tom＇s trousers提问? The red trousers are Jack's.对Jack's提问 they are trousers 和it’s trousers我想说这是裤子.应该怎么说啊 我语法不好, what's the price of your trousers?(改为同义句）___ ___ are your trousers? These are Tom's and Tony's/Tom and Tony's beds.哪一个句型对? Tony's socks are [five dollars].(对括号部分提问)____ ____ are Tony's socks?(回答) these are Tony's books.Please___.( )A.give Tong it B.give it to Tony C.give Tony them D.give them to Tony Who's trousers are these?They're jim's哪错了? Sam's/is/sweater/this are/these/trousers/sam's 连词成句 划线提问：There are four people in Tony's family.划线部分：four格式：----------- -------- people------- ------in Tony's family？ These white trousers are my brother's These are( )( )( ) white trousers llt is a paiof white boots.Would you like to buy it（改错） This pair of trousers are my father's.指出句中错误并改正 I find the trousers and blouse are in the mouse's mouth.是什么意思 where _____ my sister's trousers. 空格里用are 还是is 阿