1) （有限数目的人或物所）共有的。

• common property共有财产
• common interests共同利益
• common wall共用墙壁
• common ground共同基础
• the lowest/least common denominator最小公分母
• the greatest common divisor最大公约数
• This characteristic is common to several species.这个特点是几个物种所共有的。
• Pursuit of happiness is common to all rational human beings.追求幸福，是所有有理智的人类共通的。
• English serves as the common language of many people.英语起着许多人的共通语言的作用。

2) （无限数目的人所）共有的。

• common good公共财产
• common land公共土地
• It is common knowledge that...众所周知…
• By common consent he is the best.他被公认是最好的。

3) 通常的、普通的。

• the common cold普通感冒
• in common use普通使用的
• common mistakes in English英语的常见错误
• It is very common for teenagers to feel misunderstood.青少年常常觉得自己得不到别人的理解。

4) 一般的、不特别的。

• the common man普通人
• the common people老百姓
• He was treated like a common criminal.他受到像普通刑事犯那样的对待。
• It's common decency.这是起码的教养问题。