I have arrived in Beijing.一般疑问句

I have arrived in Beijing.一般疑问句 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 have arrived home 还是i have arrived at home i arrive in Beijing 和i have arrived in Beijing有什么区别 各位请帮我看一下这句话有没有语病,I have arrived in Shanghai,tomorrow will be reported to the office i have___ the meeting ,where have you__ A got to ,got to B arrived at arrived C reached ,arrived at D got in,reacched in i have arrived by train中的arrive 为什么用完成?而不用be there? i have just arrived here 句中arrived 是什么词性 Jimmy writes i have just arrived in London 改为间接引语 我已经到英国,I have arrived at还是in UK? 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 should have already arrived HK yesterday . When I arrived at the university,I was told that I would have to _______ a room to live in. 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? If only i ____in time!A、arrive B、arrived C、have arrived D、had arrived I have finished my homework for two hours/I have joined the army since 2005/I have arrived in London for two days.哪里错了,请告知, Have you been here for a long time?No,I ________here just now.A.have arrived B.arrived in C.arrived 顺便说一下我在学现在完成时 还有理由 为什么啊···