it is five years since we began learing English 为什么是it was

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itisfiveyearssincewebeganlearingEnglish为什么是itwasitisfiveyearssincewebeganlearingEnglish为什么是itwasitis

it is five years since we began learing English 为什么是it was
it is five years since we began learing English 为什么是it was

it is five years since we began learing English 为什么是it was
原本是It has been five years.现在成了固定句型It is...since...

? is or was

因为后面since引导的时间状语从句的谓语是begin的过去式began,为了保持时态的一致性,所以前面的is要改成was