Question: i have just begun or began?
Answer: The word 'begun' is the past participle of 'begin'. 'Begun' is used in the perfect tense sentences. It is, therefore, incorrect to write 'I begun', as 'begun' can never be used without an auxiliary verb ('has', 'have' or 'had'). Thus, we must say that something 'has begun' or 'had begun'.