我不知道他们是否到达北京的翻译：I don't know whether they will arrive in Beijing 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

I do not know if they arrived in Beijing

I don't know whether they will arrive in Beijing

I did not know whether they do arrive Beijing

I do not know whether or not they arrived at the Beijing

I don't know whether they will arrive in Beijing