[…] nominalization transformations [...] give such forms as "I persuaded John of my seriousness" from an underlying form "I persuaded John of N S", where S dominates the string underlying "I am serious" and the transformation substitutes a transform of this string for the dummy symbol occupying the position of the lexical category N, which is immediately dominated by the category symbol NP with respect to which the transformation is local.
- Chomsky (1969), a pag.215