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1·We have no class only on Sunday.

我们只有星期天没有课。

2·I have no class today.

我今天不用上课。

3·On Saturday there is no class.

星期六没有课。

4·There was no class that day!

没有类的一天！

5·We have no class on Friday.

我们星期五没有课。

6·No class should derive from a concrete class.

从接口继承，不要继承于具体类。

7·On Saturday and SundayI have no class! Yeahhhhhh!

星期六和星期天，我没有课。哈，哈，哈，哈！

8·On Saturday and Sunday. I have no class! Yeahhhhhhh!

星期六和星期天。我没有课！耶耶！耶！耶！

9·Most classrooms are locked when no class is scheduled.

因为没有上课安排，大多数的教室都关闭了。

10·We have no class today, so we can talk to each other freely.

今天我们不用上课，所以我们可以自由交流。