Is my sister a doctor?句子中有be动词时改成一般疑问句,只要把be动词提前,其它照抄下来就可以了.
Is your sister a doctor? 含有be动词句子变一般疑问句，be 提前，根据逻辑需要改变人称。
My sister is a doctor。
Are you sister a doctor
does my sister is a doctor
