i have just arrived here 句中arrived 是什么词性

i have just arrived here 句中arrived 是什么词性 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 just want to know when you have arrived I have arrived here since 3 years ago. i have arrived home 还是i have arrived at home the train arrived just now 同义句 ‘I’ve just arrived by train中的 i have just arrived by train.为什么有have.它起什么作用 Jimmy writes i have just arrived in London 改为间接引语 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