I failed my past exam
Yes, I guess you ought to make an effort to study during the week, but what about Saturday?
Would you like to go to a movie tonight ?
You don't have to study every night.
I'd rather study than fail the exams!
You're going to have to get back to me on Friday evening, but it sounds so good.
You're going to have to study harder in the future!
I'd like to, but I ought to study for my exams !