Six years has passed since he began to learn English.为什么Six

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Six years has passed since he began to learn English.为什么Six years用has而不用have呢?

six years has passed 6年已经过去
这时候6年是作为一个整体来说的,6年这么长的时间,而不是指6年里具体的每一年,既然是作为一个整体来说,那谓语动词就用单数has.
再问：有on 2020 或 by 2020 的说法么？
再答： 2020是年份，前面的介词是in。on是具体到某一天可以用by 2020，这是表示直到2020年，这时句子要用现在完成时

Six years has passed since he began to learn English.为什么Six it ( is )six years since he ( began )to learn english Six years have passed _____i began to learn English. A when It has been six years since I began to study English. 怎么翻译? 改为同义句：He began to learn english when he was six years old. he began ro learn English when he was six years old.改为同义句 i began to learn english when i was six years old对划线部分提问 it was almost six years since I bagan to learn English.(改错) He has learnt English for six years.能不能study代替learn?毕竟study表 It ___about three years since Dean began to learn English ____ six years since I began studying English.A.There are B. He has learnt English for six years改同义句