Robin had never been taught the fundamentals of grammar — he knew what worked in English because it sounded right — and so in learning Latin, he learned the basic parts of language itself. Noun, verb, subject, predicate, copula; then the nominative, genitive, accusative, cases.
— Babel: Or the Necessity of Violence: An Arcane History of the Oxford Translators' Revolution by R. F. Kuang (Page 88 - 89)
new vocabulary: copula
a connecting word, in particular a form of the verb be connecting a subject and complement.
