The Grammaring Guide to English Grammar with Exercises

Subject-auxiliary inversion

In this type of inversion, the subject and the auxiliary switch positions. In the present and past simple, the auxiliaries do/does and did come before the subject, which is followed by the bare infinitive. The word order is the same as in questions.

Subject-auxiliary inversion after negative adverbials

Subject-auxiliary inversion after SO + adverb / adjective and SUCH

Subject-auxiliary inversion in questions

Subject-auxiliary inversion in question tags

Subject-auxiliary inversion in echo tags

Subject-auxiliary inversion with SO and NEITHER / NOR to express agreement