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).