For irregular verbs, you have to change the inside vowel of a verb in most cases. Irregular verbs have their own unique tense forms and past participle. Irregular verbs do not follow the usual rules of grammar for the tense and past participle. The forms of irregular verbs can not be changed by adding ‘ed’ or ‘d’ to the end. Irregular verbs are verbs that do not follow the usual rules of grammar. As it does not follow normal rules, you have to memorize these verbs. Irregular verbs differ from regular verbs in that way you can not predict the past form or 2nd form of a verb from its first or base form. Irregular verbs do not follow the normal rule of grammar. Irregular verbs are a subgroup of verbs that do not allow the typical conjunction pattern of regular verbs. ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Top 100 DSA Interview Questions Topic-wise.