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Irregular verbs have no rules for conjugation. These can only be learnt in context - sorry!
They all have a base form. e.g. to run
A gerund (ing) form where ing is added to the end of the verb. e.g. running
An -s form where s is added to the end of the verb. e.g. runs
A past tense form which must be learnt. e.g. ran
A past participle form which must be learnt. e.g. run
See this comprehensive list of irregular verbs for the past and past participle forms, along with a pronunciation guide.