Subject-auxiliary inversion is used after the anaphoric particle so, mainly in elliptical sentences.

She punctuated each of his elliptical sentences with "Yes, Glen," but he seemed not to hear.

Responses are further classified into those which are full, major sentences, elliptical sentences and minor sentences.

For negated elliptical sentences, see the elliptical sentences section below.

Alone in certain exclamations or elliptical sentences, and in certain sentence-modifying expressions:

Responses to questions are often reduced to elliptical sentences rather than full sentences, since in many cases only the information specially requested needs to be provided.

Fonseca's voice sounds like chocolate, but she tends to talk in hesitant, elliptical sentences, tailing off into wordless expressions I find hard to read.

The uncontracted form of an auxiliary or copula must be used in elliptical sentences where its complement is omitted: Who's ready?

Modals can appear in tag questions and other elliptical sentences without the governed verb being expressed: ...can he?

In elliptical sentences (see below), inversion takes place after so (meaning "also") as well as after the negative neither: so do I, neither does she.