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 since he began to learn English.为什么Six years用has而不用have呢? ten years have passed还是has passed 2 years has passed还是have passed six years__since she left chengdu.A has passed B had passed C passed Six years has passed before I realize it.It was 12 o'clock before I realized it.这两句的区别是什Six years has passed before I realize it.It was 12 o'clock before I realized it.第一句I realize it第二句I realized it.一个用现在时,一 two years have passed 还是two years has passed还是两个都可以? 一定要说明理由 Five years _____since he died.A.have passed B.has passed C.is passed D.are passed It has passed 10 years since we met last time. eight years has passed since mr.wang _______ 结婚 Five years has passed since we met last .为什么不用have passed? Six years have passed _____i began to learn English. A when B for Csince Dbefore Several years has passed since we started our middle school life.这里为什么是has passed?several years不是复数形式吗,为什么不是用have passed He has learnt English for six years改同义句 six years has gone so fast 那位高手翻译 Three years -- since they came to this schoolA .have past B.has passed C .has past D .have passed 英语 句型转换 Ten years has passed since he left here.---- ---- ten years ---- he left here How time flies!Ten years has passed.为什么这里的Ten years是看作单数? He has already studied English for six years(改为一般疑问句)___he___English for six years___?