In my classes in English for adult learners, I saw that everyone liked learning pairs of vocabulary words with opposite meanings, like “good-bad, fast-slow, hot-cold.”

Learning vocabulary in pairs of “opposite” words is useful. Learn “claro-oscuro,” and you have a better mental picture of the opposites “light-dark” than if you’d learned “claro” by itself. Opposites can be any part of speech: adjectives, adverbs, nouns, or verbs. A list of opposites is in the appendix.