I have just arrived in Scotland. 为什么用in那,in不是在什么的里面的意思吗?

I have just arrived in Scotland. 为什么用in那,in不是在什么的里面的意思吗? I have just arrived in Scotland.我就一直没明白到底这个have要怎么用,怎么办? 在英语上怎样把直接引语改成间接引语如I have just arrived in Scotland I have just arrived in China为什么要加 have i have just arrived in china为什么加个have He says he's just arrived in Scotland. He says he's just arrived in Scotland.says He says he's just arrived in Scotland.为什在says后面不加个that 1.He says he's just arrived in Scotland.2.He says he's stayi Jimmy writes i have just arrived in London 改为间接引语 I arrived in time ___the police beating the thief为什么不是in ord she has just arrived ------USA.用from还是 in?