Answer:
Yes.
Step-by-step explanation:
Everybody has good days and everyone hes bad days. nobody is really happy 24/7 even if they act like they are, and nobody is sad 24/7. If a person is sad or upset most of the time they could have depression. however they could also just be going through a rough patch like grieving the death of a loved one or something. So yes, it is completelly normal for people to have good and bad days.