What is your father?(对 a doctor 提问)
Whose father is a doctor?(对my 提问)
Who is a doctor?（对 my father 提问)
myfatherisadoctor对画线部分提问
What is your father?(对 a doctor 提问)
Whose father is a doctor?(对my 提问)
Who is a doctor?（对 my father 提问)