moneo

Moneo, monere, monui, monitum is the standard model verb of the second conjugation, which is why it turns up in every grammar table ever printed. It is causative in origin, "to make someone think", from the same root as mens and memini.

Constructions are worth memorising. The person warned goes in the accusative, the subject of the warning in de plus the ablative, and what you want done in a ut or ne clause with the subjunctive: te moneo ne facias. It also takes an indirect statement in the sense "remind that". Compounds fill out the family: admoneo, commoneo, and the noun monitum, "a warning", plus monumentum, a thing that reminds. English monitor, admonish, monster and money all descend from it, the last through Juno Moneta, in whose temple the Roman mint stood.