3предложения с "you should" и "you should not", на тему: "как не испортить зубы". !

+You should clean your teeth two and more times a day
+You should eat apples after eating
+You should usually visit a dentist 
-You shouldn`t eat a lot of sweet food
-You shouldn`t forget about cleaning teeth
-You shouldn`t drink a lot of coffe and other colorig drinks
если нужен перевод - напишу)