How to use khi in Vietnamese?
To express two actions done at the same time by one or more than one person or one subject, you can use “khi” by following this pattern below:  Subject +  action 1 + khi + subject + action 2 or Khi + subject +  action 1, subject + action 2 You can use “khi” only to describe two short actions which are happening at the same time or as a daily habit.