Common指某一事物经常在许多地方发现或发生，依照某一事是否常见判断，因此有平常无奇的意味，可引伸为平凡之意：例如：

This is quite a common occurrence.象这样的事常常发生。

General指普通的，一般的，与高级的相对应：例如：

The book is intended for the general reader, not for the specialist.这本书是为一般读者写的，不是为专家写的。

Ordinary依照一般标准来判断，因此有平淡无奇的意味。例如：

His speech is just ordinary.他的演说就是平淡乏味。

Ordinary men and women can work miracles in our country.在我国，普通男女都能创造奇迹。

Usual是依照某人的常例来判断，强调遵循常规，一贯如此。例如：

The morning he came earlier than usual ,for it was not an ordinary day. 今天上午他到得比平常早，因为这是不平凡的一天。

He paid the usual fee.他按规定交费了。

Foolish, silly和stupid区别

Foolish指缺乏理智或判断力：例如：

This is a foolish mistake on the crossword puzzle.这是填字游戏中犯的一个愚蠢的错误。

Silly指由于奇怪的谈吐或举止而显得愚蠢和滑稽：例如：

Monkeys usually do silly tricks in their cages.猴子常在笼子里做令人发笑的把戏。

Stupid指武生的迟钝。注意其反义词是clever：例如：

He is a stupid man.他很愚钝。

Feature，quality和characteristic用法与归纳

Feature:(typical or noticeable) part or quality特征、特点、特色；

　　　　any of the noticeable parts of the face容貌上引人注目的部分；

a special long article in a newspaper or magazine(报纸、杂志上的)特写；

a film being shown at a cinema(电影的)正片、故事片

characteristic: a special and easily recognized quality of someone or something; 特征、特性、特色

　　　　　Good planning is one of the characteristic of a successful business.

Quality: the degree to which something is excellent; standard of goodness质、质量　例如：

　　　　The quality of the service here has improved a lot.

A high standard of excellence优质　例如：

It is difficult to recruit teachers of quality. 要聘用到素质好的教师是很困难的。

Something typical of a person or thing;

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