这两句英语的区别?I arrived by train.I've arrived by train.

这两句英语的区别?I arrived by train.I've arrived by train. ‘I’ve just arrived by train中的 I've arrived by train为什么不是I arrived by train? I arrived by train a moment ago.的同义句 这句句子语法对吗I've arrived by train a moment ago. 英语句子结构改写：I arrived by train a moment ago. i have just arrived by train.为什么有have.它起什么作用 I have just arrived by train这里为什么要用现在完成时呢 i have arrived by train中的arrive 为什么用完成?而不用be there? ‘I have just arrived by train,’she said.变成间接引语 表状态情绪感觉精神活动的动词,不用现在完成时对吗～I have just arrived by train 这句话对吗 She had just arrived by train.找出错误