5.The old man is a doctor.(提问) 6.The boy with a big mouth is my brother.(一般疑问句)
问题描述：
5.The old man is a doctor.(提问) 6.The boy with a big mouth is my brother.(一般疑问句)
答
What is the old man?
Is the boy with a big mouth your brother?
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答
5 What is the old man?（那个老人是干什么的？）
6 Is the boy with a big mouth your brother?
答
5.Who is a doctor(对主语提问）
What is the old man?（对表语提问）
6.Is the boy with a big mouth your brother?