cost作名詞：

　　cost可以是可數(shù)名詞，意為“費用;花費;價錢”，指購買、做某事或制造某物的總價值是多少錢。如：

　　The cost of a loaf of bread has increased five-fold. 一條面包的價錢增長了4倍。

　　Badges are also available at a cost of 2.50.

　　徽章也有賣的,2.5英鎊一枚。

　　cost作為復數(shù)名詞使用，意為“成本，費用”。如：

　　The company admits its costs are still too high. 該公司承認其成本仍然過高。

　　Costs have been cut by 30 to 50 per cent. 成本降低了30%到50%。

　　He was jailed for 18 months and ordered to pay 550 costs.

　　他被監(jiān)禁了18個月,還責令他支付550英鎊的訴訟費。

　　cost可以做為不可數(shù)名詞使用，意為“成本，成本價”。如：

　　...a store that provided cigarettes and candy bars at cost.

　　按成本價出售香煙和糖果的商店

　　...a practice known as dumping – that is, selling below cost to drive competition out of business.

　　傾銷行為——即通過以低于成本的價格銷售產(chǎn)品來擠垮競爭對手

　　cost做為定語名詞，通常用來修飾另一個名詞。如：

　　cost consciousness; cost overruns.

　　成本意識；成本增量

　　cost作動詞：

　　cost作及物動詞，意為“費用；花費”的意思。

　　This course is limited to 12 people and costs 50.

　　該課程只招收12人,學費為50英鎊。

　　Painted walls look much more interesting and doesn't cost much.

　　彩繪墻壁看上去更有趣而且花費也不高。

　　It's going to cost me over $100,000 to buy new trucks.

　　要買新卡車得花掉我10萬多美元。

　　cost作不及物動詞，指需要特定的費用、支出、努力或丟失：

　　It costs more to live in the city.

　　在城市居住要付出更多東西