If you insist on leaving now, please go ahead. 你一定要走,那就請便吧。
Well, if you don't want to study, do as you please. 你要是不想學習,那就請便吧。
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)