Regular vocabulary in English create the past simple and past participle by adding -ed to the base form. If the vocabulary ends, change the “y” to an “i” and add “ed”: If the vocabulary ends “e,” just add “d”: If the first syllable of a longer verb is stressed and the vocabulary ends, just add “ed”: The “usual” rule is to add -ed or -d to the base form of the vocabulary to create the past forms. A regular verbs is one that conforms to the usual rule for forming its simple past tense.