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be a counterfeit
counterfeit 作名词时是可数名词，指被冒充为真品的伪造物。
This painting is a counterfeit.
这幅画是赝品。
伪造品；赝品
先理解核心含义，再看它在真实句子里的用法。
伪造品；赝品
A fake or imitation, especially money or documents, made to look like the original and deceive.
This painting is a counterfeit.
这幅画是赝品。
非正品；假货
A non-genuine article; a fake.
冒充原件的复制品
a copy that is represented as the original
伪造者；造假者
One who counterfeits; a counterfeiter.
Experts examined the painting and confirmed it was a counterfeit.
专家检查了那幅画，确认是赝品。
The market is flooded with counterfeits of popular luxury goods.
市场上充斥着流行奢侈品的仿冒品。
She was shocked to learn that the gold coin she inherited was actually a counterfeit.
她震惊地得知继承的金币实际上是赝品。
counterfeit 作名词时是可数名词，指被冒充为真品的伪造物。
This painting is a counterfeit.
这幅画是赝品。
of 后接被仿冒的原件，表示某件赝品模仿的对象。
They found a counterfeit of the painting.
他们发现了那幅画的赝品。
declare 后可接宾语和名词补足语，表示正式判定某物为赝品。
The expert declared the banknote a counterfeit.
专家宣布这张钞票是假币。
Not this
He sold many counterfeit in the street market.
Use this
He sold many counterfeits in the street market.
counterfeit 是可数名词，表示“假货/赝品”时复数形式为 counterfeits；many 后要用复数，不能像中文“假货”那样当作不可数名词。
Not this
Counterfeit is a serious crime.
Use this
Counterfeiting is a serious crime.
表示“伪造行为”时要用动名词 counterfeiting；counterfeit 作名词指具体的“假货”或“伪造者”，不指行为本身。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
……的赝品
The vase was a counterfeit of a Ming dynasty original.
这个花瓶是明代原作的赝品。
识别赝品
The expert detected the counterfeit within seconds.
专家几秒钟就识别出了那件赝品。
把赝品当正品使用
He was caught passing a counterfeit at the pawnshop.
他在当铺把假货当真货使用时被抓住了。
结果是赝品
The rare stamp turned out to be a counterfeit.
那枚稀有邮票结果被证明是赝品。
制造赝品
The gang was arrested for producing counterfeits of designer handbags.
这个团伙因制造名牌手袋的赝品而被捕。
销售假货
The vendor was selling counterfeits at the market.
那个小贩在市场上卖假货。
Use counterfeit naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：counterfeit 开头像 counter（柜台）——假货在柜台上一验便露馅，和真品对不上。
语域：formal 常见场景：product authentication、legal documents 该名词义项多用于正式或书面语境，指假货、赝品或造假者，例如商品鉴定和法律材料中；日常口语较常说 fake。具体搭配会因场景而异。
可数名词，常指伪造的货币或商品
Dictionary facts from ECDICT, WIKTIONARY.