OK, today's are great. They were given a situation of someone with a problem, and had to write a paragraph of advice (to use modal verbs like should, ought to, etc.) Here were my two favorites
Situation: a girl is wondering whether to break up with her fiance because he doesn't talk about his feelings and doesn't do anything considerate for her.
Advice: "He doesn't know how to please you; this also means he doesn't know how to please other girls. You should be happy for that."
Situation: a guy has a crush on his female friend. She has a boyfriend who treats her badly and this guy can't get up the guts to tell her how he feels.
Advice: "You ought to write a card to her, to say how you love her. You'd better tell her that you are her real Mr. Right. You are supposed to be stronger than her boyfriend & kill him. You have to buy anything that she likes. You must marry her."