L：Michael，别往我头上扔雪块，行吗？你如何象个孩子呀！
M: Li Hua, I'm just goofing2 off.
L：你就是讨厌。我不懂什么是goofing off.
M: Actually Li Hua, to goof off does mean that I'm acting3 stupid and not being serious. Goof is a verb.
L：噢，to goof off 就是干无聊的事，那你确实非常无聊，老向我扔雪块。
M: To goof off is a great term. Young people use it a lot. It is often used to describe how young people are behaving.
L：青年常常用to goof off来形容其他人的行为？我记得念中学时班上有个学生总是打断老师的话，喜欢开玩笑，你可以说这个学生是goofing off吗？
M: Yeah, that's right. Children or young people often goof off. Do you remember when we were at the movies and those high school students threw candy at the screen, you could say they were goofing off.
L：对，没错，孩子和青年常常会做一些无聊的事开玩笑。我才不会忘掉大家那次去看电影的事呢。那几个中学生往银幕上扔糖果，真是太无聊了，他们还以为好玩呢。
M: To tell you the truth, when I went to the library in high school with my roommates we would usually waste time and ended up goofing off.
L：你是说，你念中学时跟同学去图书馆读书，结果在那儿互相扔纸球？
M: Yeah, that's right.
L：怪不能你刚开始考不上大学呢！行，教室到了，下课等我一块去图书馆，可千万不要goof off。
L：这课真是枯燥无味。我最讨厌晚上上课，每次上完课，我都感到非常累。
M: That's right. Even though it's not that late, I'm ready to hit the sack!
L：你怎么说？你要去捅一个口袋？Sack不是麻袋吗？我以为你非常累了，而你目前要去运动？
M: No, no. It's a colloquial4 saying. I mean I'm going to bed. Sack, here means bed, and hit means going to.
L：噢，原来to hit the sack是指去睡觉，sack在这里是指床，hit是去床上睡觉的意思。那我要坐下，能否说to hit the chair?
M: No, not really. This phrase -- to hit the sack -- has a pretty limited meaning.
L：哟，to hit the sack只能指去睡觉，别的地方还不可以用！那如果我午想睡个午睡，能否说：I want to hit the sack?
M: No, it's usually used to talk about going to bed at night, after a long day at work or school.
L：午睡也不可以用，只能指一天工作和学习后晚上去睡觉。那目前我已经上了一天的学，再加上晚上上了这堂枯燥无味的课，我可以说：It's time for me to hit the sack。对不对？
M: That's correct, Li Hua. But don't forget that we have a test tomorrow.
L：我当然不会忘掉明天的考试。
M: Ok, now go hit the sack, but after tomorrow's test we will have to study seriously for next week's test, no more goofing off.
L：明天考试后你想认真学习，为下星期的考试作筹备。没问题，我助你筹备，大家两个都会考得非常不错。
M: Yeah, I'm going to hit the sack. Bye, Li Hua!
Michael 今天教了李华两个常用语，一个是：to goof off，意思是做一些无聊的事，开玩笑；另一个是：to hit the sack，这是指晚上上床睡觉。