1.worth用作名词时意为“价值”,其前的名词主语如具有复数意义,则应采取复数形式并加上所有格形式'或's。
2.“...pounds worth+of+复数名词”在句中作主语时,在强调“价值”时谓语动词用单数形式,强调of的宾语名词时谓语动词用复数形式。

He has a jewel of great worth.他有一颗价格昂贵的宝石。
We never know the worth of water till the well is dry.井干方知水可贵。
His net worth is reckoned at over a million dollars.他的财产净值估计超过百万美元。
She has just bought twenty dollars' worth of sugar.她刚买了20美元的糖。
Nearly a thousand pounds worth of cigarette were stolen.大约价值1000英镑的香烟被盗。

worth, merit, value, virtue
参见merit条。

［同义词］ n.  value
［词源］＜古英语weorth(值得…的)

1.有些语法学家认为worth是形容词,但实际上worth更具有介词的语法特征,可支配名词短语,带逻辑主体的动名词和wh-从句,但不能跟主动不定式。
2.worth常用于sth is worth v-ing结构中,动名词短语在这里表示被动意义。本结构中的sth 有时可换用it,这时it是形式主语,动名词短语是真正主语。

for  what it is worth
(真伪未明但)不妨暂时这样说〔听,看〕however much or little importance or value sth has
We can take the story for what it is worth.这个故事我们可以姑且听之。
For what it is worth,I overheard them planning a robbery.不管是真是假,我无意中听到他们在策划抢劫。

worth (sb's) while
值得去做profitable or interesting to sb
I don't think it's worth while.我认为犯不上。
It's not worth your while reading this book.这本书不值得你读。
It is worth our while to try this experiment.这个试验值得我们去做。

The picture is worth at least twenty pounds.这张图片至少值20英镑。
This ring is worth little.这枚戒指值不了多少钱。
The bicycle is not worth what you paid for it.这辆自行车不值得你付出那么多钱。
Her promise isn't worth a penny.她的诺言一文不值。
The novel is worth reading.这部小说值得一读。
It is hardly worth talking about.这事何足挂齿。
The matter is not worth your troubling about.这事不值得你为之烦恼。
To see for yourself is worth all the books of travels.行万里路胜读万卷书。
He is well worth sorrow that buys it with his silver.花钱买苦吃的,理应吃到苦头。
He is worth a million.他是个百万富翁。
The heiress is worth at least a million dollars.那位女继承人至少有百万家当。

worth, worthy
这两者用法的区别在于:worth是介词,不能作定语,作表语时后面必须接名词性词组; worthy是形容词,可用作定语,作表语时后面接“ｏｆ＋名词”或动词不定式。