这句句子语法对吗I've arrived by train a moment ago.

这句句子语法对吗I've arrived by train a moment ago. I arrived by train a moment ago.的同义句 英语句子结构改写：I arrived by train a moment ago. ‘I’ve just arrived by train中的 I've arrived by train为什么不是I arrived by train? 这两句英语的区别?I arrived by train.I've arrived by train. 看看这句句子语法对吗? 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 i want to find out,only belong to my dependence.这句句子语法对吗 Tom_for shanghai by train a moment ago.a.left b.leaves c.lef 这句句子的语法对吗?急!可追加! I have been there.这句句子对吗?为什么?