Teacher: "John, what is the past participle of the verb to ring?" John: "What do you think it is, sir?" Teacher: "I don't think, I KNOW!" John: "I don't think I know either, sir!" 老师：“John，动词ring的过去分词是什么？” 约翰：“你想它是什么呢？” 老师：“我不用想，我知道！”。 约翰：“我想我也不知道”。