The film has bugun since 30 minutes ago.这里has后不用加been吗

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• The film has bugun since 30 minutes ago.这里has后不用加been吗
• The film has bugun since 30 minutes ago.这里has后不用加been吗
• 短文改错:1.it is over about 3 years now since i began studying english2.As first i found it very difficult.i couldn't get most of sounds right,3.spell the words correctly and remember the rules of the grammer.4With the heip of my English teacher and classmates,i have made5.many progress.Now i am getting on well with my English study.6.Three year's study have taught me that one can't learn English7.well without work hard.we shouid do more intersting listen
• it ( is )six years since he ( began )to learn english为什么是上面这个用法啊,since不是加完成时的吗,我觉得是was,began