Is this his brother?(改为复数句子) Is he my friend？（做出肯定，否定回答） Those are her pencils.

(改为单数句子)

Are these his brothers?
Yes, he is.
That is her pencil.

求采纳～

你好！ Is this his brother?(改为复数句子) Are these his brothers? Is he my friend？（做出肯定，否定回答） Yes, he is. No, he isn't. Those are her pencils.(改为单数句子) That is her pencil. 希望对你有所帮助，望采纳。