1.作為“知識，學問，學識”的總和或抽象的含義時，都是不可數名詞。另外，作“知曉；知悉；了解”也是不可數名詞。因此，一般情況下，都不能與a（an）不定冠詞連用，也沒有複數形式。如：

Langston Hughes always seemed to know exactly who he was ,and those knowledge helped make him one of the most respected writers in the United States.(托福改錯題，knowledge錯誤地寫成：knowledges)

蘭斯頓休斯似乎總是很清楚自己是誰，這些知識使他成為美國最受尊敬的作家之一。

Classification is a useful approach to the organization of knowledge in any field.

分類是系統化知識的一個有用的方法。(托福改錯題，knowledge錯誤地寫成：knowledges)

For years we had little knowledge of what life was like inside China.

以往很多年我們對于中國國内的生活情況所知甚少。

Knowledge is prower.知識就是力量。

A little knowledge is a dangerous thing.

一知半解是很危險的事。

2.當knowledge指人們對某一具體事物或具體學科的知識時，可以與不定冠詞a(an)連用，不管有無定語。如：

The old man has a good knowledge of Beijing.

這位老人非常了解北京。

He has a wide knowledge of painting and music.

他在繪畫和音樂方面知識淵博。

She has acquired a good knowledge of English.

她英語已經學得很好。

For this job you will need a good knowledge of both Italian and Spanish.

擔任這項工作需要精通意大利語和西班牙語。

She has an encyclopedic knowledge of natural history.

她具有廣博的自然史知識。

Many people agree that a good knowledge of English is a must in intermation trade today.

許多人都認為在當今的國際貿易中，精通英語是必須的。(96高考真題)

One way to understand thousands of new words is to gain a good knowledge of basic word formation.

掌握基本的構詞法是理解成千上萬的生詞的一個方法。(02上海高考真題)

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