My friend is nine years old变一般疑问句,特殊疑问句和否定句,划线ni
问题描述：
My friend is nine years old变一般疑问句,特殊疑问句和否定句,划线ni
My friend is nine years old变一般疑问句,特殊疑问句和否定句,划线nine years old
答
Is your friend nine years old?；How old is your friend?；My friend is not nine years old.