I played hooky today.
Why did you play hooky?
I was tired and didn't feel like going to school.
It is not good to skip school, it could affect your future and get you in trouble. You should try going to bed earlier if you feel tired in the mornings.
But it was only one day.
Sure, it was only one day, but it's still wrong to skip school. I'm sure your parents would be disappointed to find out that you didn't go.