This is 什么 old umbrella

Here is my umbrella和This is my umbrella这两个句子有什么区别?This和Here有 is your umbrella this 连词成句 Is this your umbrella?肯定回答是什么 this is my umbrella根据my提问 Is this your umbrella?的复数形式 This is my umbrella 改成疑问句 This is the umbrella ()last mouth. 把This ia an umbrella.This is a William's umbrella.This ia aW Whose umbrella is this? Is it______? A.Tom This is a old sweater .有什么错误 This is your umbrella.please take them away. 改错 this is not my umbrella.把句子变成复数形式