Break a leg! 祝你好運！相當于Good luck! 表示對對方的祝愿和祝福。回答語一般用thanks等。如：

A: Are you nervous（緊張的）?

B: Yes， a little. It is a big competition.

A: Break a leg!

B: Thank you.

The very best of luck with you！祝你走運。和上句話意思基本一樣，同是表達美好祝福和祝愿的話語。如：

A: Are you going to Super Voice Girl Contest？

B: Yes. I hope I will do a better job.

A: The very best of luck with you!

B: Thanks a lot.

Have a ball! 玩得高興！相當于Have a good time! 祝你（們）玩得開心愉快！可以用作祝愿語。如：

A: How do you spend your weekends?

B: I want to go to the park with Tom.

A: Great！

B: Would you like to go with us?

A: I’d love to， but I have to do my homework. Have a ball!