例句-1:My teacher gave me plenty of advice on how I could improve my grade before the end of the semester. Now the ball is in my court. I have to decide whether I'm going to make the effort to get more serious about studying.
例句-2:I know I was wrong. I shouldn't have told my girlfriend that she was selfish. But after leaving her messages and sending her e-mails to apologize, there's nothing else I can do. At this point, the ball is in her court. She has to take the next step and let me know if she forgives me.