Inversion or inverted word order is the order of words in which the subject is placed after the predicate. The inversion is partial when only a part of the predicate is placed before the subject
The inverted word order is used in
1. Questions:
(General) Do you want to help him?
(Alternative) Would you like tea or coffee?
(Special) What are you doing?
(Tag) She is smart, isn’t she?
Questions to the subject or subject group have the direct word order:
Who is helping you?