Lesson 68是一个有关家庭聚会的小故事。本课的教学目的与前面第66课相同，宣传遵守公共道德。在表现手法上也与第66课相同，都是采用最后点题的手法，从而使课文充满幽默感。
课文导读
本单元的两篇课文是两个很有趣的故事，通过学习第一篇《The queue Jumpers》让我们能够掌握有关排队等候看病的一些知识，并养成排队等候的习惯，讲文明讲礼貌不做加塞者。学习第二篇《You must stop making so much noise》后我们可以了解到西方人的一种社交场合party（聚会），并从中学会讲究礼貌，在拜访别人，或举行聚会时要把握好时间分寸，不能影响别人的生活。
教学情态动词must的用法
情态动词must表示“应该”，“必须”。否定式must not＝mustn’t表不“不应该”，“不许可”，“不准”，“禁止”等。本单元mustn’t主要用法是表示“禁止和警告”。在回答must的问句时，否定式常用need not＝needn’t或don’t have to，表示“不必，”而不用must not=mustn’t。因为mustn’t表示“不可以”。表示推测“一定”，“必定”只用在肯定句中，老师在向学生简要讲明其主要用法以后，通过大量的操练让学生掌握。例如：
1. You must look after yourself．
2. We must finish our homework on time．
3. Li Ming must wait for his father at the bus stop．
4. They must clean their classroom every day.
5. We mustn’t laugh at others．
6. You mustn’t draw on the wall．
7. He mustn't leave to early．
8. They mustn’t climb trees.
9. A: Must she go shopping tomorrow?
B: Yes, she must./No, she needn't.
10. A: Must we do the cleaning this afternoon?
B: Yes, we must./No, we needn't.
11. When and where must we get on the train?
12. Who must go to the meeting?
13. Who must I ask about the way to the TV station?
14. Whose car must the man clean?
15. Why must I stand in line?
教学由when, before, after引导的时间状语从句和由if引导的条件状语从句
本单元的第二个语法项目是由when，before，after等连词引导的时间状语从句和由连词if引导的假设性的条件状语从句。可用英译汉、汉译英或填空等方式进行口头和书面练习。
1.When
(1) When she reached home, she had a short rest.
(2) Will you please lock the door when you go out?
(3) When he was a middle school student, he liked playing football very much.
(4) Don't run the machine when something is wrong with it.
2. before
(1)I must finish my homework before my mother comes back.
(2) You must have something before you go to school.
(3) Where did you live before you moved to Beijing?
(4) Please take these things away before you leave the room.
(5)Before I left, I rang him up.
3. after
(1) They go out for a walk after they have supper.
(2) The woman looked worried after she found her ticket lost.
(3) I went to bed after I finished writing my diary.
(4) What do you do after class is over?
(5) They talked about the party after the people left.
4.if
(1) If it doesn't rain tomorrow, we will leave for Beijing.
(2) If you jump the queue, other people will not be pleased.
(3) If you like my pen, I will give it to you.
(4) If he studies hard, he will catch up with his students.
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