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.为什么有have.它起什么作用 i have arrived home 还是i have arrived at home I have just arrived by train这里为什么要用现在完成时呢 ‘I have just arrived by train,’she said.变成间接引语 i have arrived by train中的arrive 为什么用完成?而不用be there? ‘I’ve just arrived by train中的 i have just arrived here 句中arrived 是什么词性 这两句英语的区别?I arrived by train.I've arrived by train. 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 should have already arrived HK yesterday . I have arrived in Beijing.一般疑问句 If only i ____in time!A、arrive B、arrived C、have arrived D、had arrived 用完成时还是过去时?为什么?I arrived by train a moment ago和I have arrived by train a moment ago 哪句对?还是两句都对?为什么? 翻译:by now they will have arrived home. you can have a party before I have arrived对不对还是把have arrived 改成arrive I have just arrived in China为什么要加 have i have just arrived in china为什么加个have I arrived by train a moment ago.的同义句