Answer:
Almost all forms of interrogative sentences (without subject questions and embedded questions) use inversion. These sentences always place the auxiliary verb before the subject.
Example:
Is he going to the club?
Did he go to the club?
Where is the club?
Who is that guy standing there? (No inversion for it is a subject question)
Inversion in other expressions:
Many other negative and affirmative sentences use inversion.
1. Affirmative and negative agreement: only after so, nor, neither but not in the cases of either and too.
Examples:
Alex went to the club, and so did his brother.
Alex went to the club, and Jenny did too. (No inversion)
Robert hasn’t reached yet, neither has his companion.
