One day my friend asked me, "Did you ever see the watermelon tree?" When he asked me this question, I was confused. He asked me again, "Did you see the berry tree?" I considered these quesitons and I answered, "No." The watermelon grows on the ground. It isn't a tree. Berry, a plant, isn't a tree. I answered these questions. My friend said, "You are not bad." I said, "Of course, these questions are easy for me. Next time, you can give me more difficult questions.