Thank you for your sincere comments. Well, I didnt know it was such bad words until I talked with my friends about f-words last night. Cause I could have heard of it from movie, TV, public place, and even children, I knew that those words were not too serious..... To tell the truth, it was not true to bring up at class. Only the reason was that it sounded a little funny to me when I heard somebody spoke them. So I tried to make order them..... I am really appreciating you about the last two sentences that make me relax. Have a nice weekend, too~~~~~