Какая мораль в басне Сергей Михалков «Ошибка»

я ученица 5 класса домашняя работа из рабочей тетеради автора биболетова. если что тест 2 на стр 24  №3.
Пример:Your parents were in German this summer ...?-Your  parents were in German this summer,weren'they.(Потокому принцепу восемь пунктов)

1. Your brother goes to Chess Club,_______
2. Ann can ski very well,_______
3. You didn't  visit Paris last year,_______
4.This  boy is our new classmate,_______

5.Her classmates weren't in the zoo last year month,_____

6.We won't play tennis at the weekend,_____

7.Our class will go the museum tomorrow,______

8.The film was great,______