1) Se bueno con los primos.
-> Be good with your cousins.
2) Tienes que hablar educamente.
-> You have to speak politely.
3) No puedes faltar el respeto.
-> You cannot be irrespectful.
4) Tienes que comportarte y tener modales.
-> You need to behave and have manners.
5) Tienes que ayudar con la cena,
-> You need to help out with dinner,
6) No puedes pelear con tus hermanos.
-> You cannot fight with your brothers (siblings).
7)Tienes que limpiar la casa
-> You need to clean the house.
8)Vamos a comprar mucha comida.
-> We are going to buy alot of food.
9) Tienes que ponerle atencion a tu abuelo.
-> You need to pay attention to your grandfather.
10) Tienes que ir a cenar a tiempo.
-> You need to eat dinner on time.
Since the description says to write it in affirmative (positive form) , here are all of those that I wrote above, using "no", this time, affirmatively.
3) Se respetuoso. = Be respectful.
6) Debes comportarte con tus hermanos. = You need to behave with your brothers (siblings).
Hope it helps. xx
:)