I don't think I know

　　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：“我想我不知道”。