何健问陈玄：
Did you know that by this Sunday, smoking in public
indoor areas will be prohibited? (我点评一下： 这个过去时态用得不错，因为不是真正意义上的提问，而是信息传输式的叙述。)
问题是，陈兰花回答就显得很菜了，英语很烂地说：
I don't know that.
人家何健不是已经告诉你了么？还用现在时态I don't know?
Of course you know now, although you did not
know until he told you about that.