आप कब आओगे?

Definition in English: used when you want to find out when someone is going to come 

Definition in Hindi: इस्तेमाल तब किया जाता है जब आप यह पता लगाना चाहते हैं कि कोई व्यक्ति कब आने वाला है

Example: I reached the exhibition and called my mom and asked her in Hindi ‘aap kab aaoge?’