Question

what have you done .(change in simple past)​

Answer 1

What did you do?

Explanation:

• The past tense is used to narrate an already happened action in a time before now.

• The time of the action happened can be in near past or distant past, but it does not matter how long the action lasted.

• The simple past tense is different than past continuous tense.  

• The formula for simple past tense is to add "ed" to the basic form of the verb or just "d" if it already has an "e" at the end.

Answer 2

What do you do?

Hope it helps ✌