Although informal styles typically shorter, containing several abbreviations, contractions, and deletions not usually allowed in formal styles, they are also rule governed. For example, informal questions in English can be shortened by having the auxiliary verb and/or the subject you deleted can be shortened when used in an informal context, either by deleting the auxiliary verb in (15a) or by deleting the auxiliary verb and the subject in (15b). This is in contrast to (15c), which is not acceptable because it does not follow the rule of deletion in English informal questions.
Like regional and social varieties, styles can also be distinguished by different linguistic features involving all the components of the grammar. For example, the language used at court is very distinct in its vocabulary, phonology, and sentence structure. Therefore, it is not an individual feature, but rather a cluster of characteristic features at various levels of the grammar, which contribute to a particular style of language.