characteristics of a well writen smart goal:
It includes a deadline to be completed.
It states exactly what action is needed.
It is related to the person’s overall goal.
It indicates how often something will be done.
i think your missing part of your question. i hope this is at least a little help.
Answer:
Both are correct
Explanation:
Why didn't you finish homework? And why don't you finish homework?
Shows that you want to know the reason for the incomplete work.
Reasoning is what these questions lead to.