四、句型转换1、This is my pencil case.（改为一般疑问句）2、Is this your sofa?

1、Is this your pencil case?
2、Is this your sofa?（作否定回答）:No,it isn't .
3、My telephone number is （4221155）（对“4221155”提问）
What is your telephone number
4、 That is your/ my backpack.
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