please yourself表示恼怒和不关心，意思是：”随你的便，悉听尊便“。
如：
--I don't think I'll bother finishing this.我想我不必费力做完这件事了。
--Please yourself.随你的便。
做个练习试试：
--The ice cream is really delicious. Can I have some more?
--______.
A. Behave yourself B. Please yourself C. Do it yourself D. Be my guest.
答案：D。
help yourself：请随便
please yourself：自便
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