Questions & Answers about Servus rogat dominum: “Cuius est hic liber?”
Latin has no articles (the / a / an). A bare noun like servus can mean a slave or the slave depending on context. In a story, once a character has been introduced, English often uses the even though Latin still just says servus.
Servus is nominative singular (2nd declension). The nominative is typically the subject of the clause. So servus rogat = “the slave asks.”
Rogat is 3rd person singular present active indicative of rogāre (“to ask”). The -t ending usually marks he/she/it in the present tense: (he) asks.
In servus rogat dominum, dominum is accusative singular because rogāre takes a direct object: you “ask someone.”So = “the master” as the person being asked.