Near the very beginning of her letter to Aeneas, Dido twice uses a familiar trope, commonly known as zeugma. She will use it more times in the course of her letter.
Zeugma: A trope in which one verb governs several words, or clauses, each in a different sense. Example: “He stiffened his drink and his spine.” (A more elaborate description can be found here, and more examples here.)
Certus es ire tamen miseramque relinquere Didonatque idem venti vela fidemque ferent.certus es, Aenea, cum foedere solvere navesquaeque ubi sint nescis, Itala regna sequi.
You are then resolved to depart, and abandon unhappy Dido;The repetition of this trope early on is noteworthy -- it is not the case with other of Ovid's letter writers that they exhibit this level of rhetorical facility right off the bat. In addition to two zeugmas, she also uses anaphora -- the repetition of the same opening words, certus es... certus es. Her speech abounds in rhetorical tropes. Let us not forget that Dido asks for only one thing in this letter: that Aeneas read her carmen. She's a born writer!
the same winds will bear away your promises and sails.
You are resolved, Aeneas, to weigh your anchor and your vows,
and go in quest of Italy, a land to which you are wholly a stranger.