Is that girl his sister?（作肯定回答） Is helen his grandmother?（作否

Is that girl his sister?（作肯定回答） Is helen his grandmother?（作否 Is that girl his sister?作肯定回答 Is that his ruler(作肯定回答) is that his jacket?　（作否定回答） is　this　her　key?（作肯定回答） Is that his sister?肯定回答 Is that his ball改为复数并作肯定回答 将下列句子变成一般疑问句,并作简要的肯定回答和否定回答:That is his sister that is his ruler.(改为一般疑问句并作肯定回答） this is his book that is your ruler 改成一般疑问句并作肯定否定回答 That is his brother.改成一般疑问句,怎么改并作肯定回答和否定回答 Is That girl her friend?作肯定或否定回答 that is his brother改为一般疑问句并作肯定或否定回答