The term "pre-tenses" does not exist in the English language, so there are no antonyms for it. However, if we break the word down, the prefix "pre-" means before, while "tenses" refers to the grammatical category of verb conjugation that indicates time. Some antonyms for "before" might include after, later, or subsequent. Additionally, opposite to the verb tense related to the past, some antonyms for the verb tense related to the future might include present or present continuous. It essential to get familiar with grammar concepts and vocabulary to understand antonyms properly.