In English, the verb is always preceded by the preposition âtoâ as in âto speak,â âto read,â or âto write.â In Spanish, infinitives consist of only one word and are separated into three different conjugation sets according to their endings, -AR, -ER, and-IR such as âhablar,â âleer,â and âescribir.â.erbs in the infinitive form indicate what an action is, but do not indicate anything about who is doing the action or at what point in time the action is taking place.