Late for school

Po Po was late for a weekend class so her teacher asked her.

Teacher: Po Po, you know that we have extra class during this weekend, why are still late?
Po Po: Atually I should have been for fishing with my dad but he doesnot allow me to go with him. That is why I am late.
Teacher: He is right. He doesnot allow you to go because he wants you to study. You know study is very important!
Po Po: Coz he has only one fishing rod....