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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AmericanEnglishhassomanydfialectsbecausepeoplehavecomefromallovertheworld.(peoplehavecomefrom为什么要用ha

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)
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)

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。