`C2:`
`text{1.Is that her ruler?}`
`text{2.Those are not my books.}`
`text{3.Is your sister an engineer?}`
`text{4.Are your brothers doctors?}`
`text{5.What is his name?}`
`XI.`
`text{1.Her name isn't Linh.}`
`text{Is her name Linh?}`
`text{2.They aren't nurses.}`
`text{Are they nurses?}`
`text{3.I'm not an engineer.}`
`text{Are you an engineer?}`
`text{4.Those aren't his pens?}`
`text{Are those his pens?}`
`text{5.My father isn't a doctor.}`
`text{Is your father a doctor?}`