American English has so many dfialects because people have come from all over the world.(people have come from 为什么要用have这个现在完成时态 能说 because people come from all over the world)

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American English has so many dfialects because people have come from all over the world.(people have come from 为什么要用have这个现在完成时态 能说 because people come from all over the world)

这个问题还真不太清楚.
从语法上讲,改为一般现在时是没有错误的;也许是习惯问题

我个人认为不用现在完成时,一般现在时比较准确吧。