Answer:
Descanse
Explanation:
1. Begin with the yo form of the present
Descanso
2. Drop the "O" ending
Descans
3. Add the proper ending
e for usted, en for ustedes (ar verbs)
a for usted, an for ustedes (er and ir verbs)
Descansar is an ar verb, so we will add an e.
Descanse
Hope this helps! :)