There is a fun fact about the question “khi nào?’’ in Vietnamese. When it stands in the beginning of the question means asking about the future, for example: Khi nào bạn đi Việt Nam? (When will you go to Vietnam?). When it stands at the end of the question, it’s asking about the past: Bạn đi Việt Nam khi nào? (When did you go to Vietnam?). Isn’t it cool? :p