一、作名词的用法
1.表示“兴趣；关注”（不可数名词）
o基本含义：指对事物的好奇心或参与意愿。
o常用搭配：
§show/have/take (an) interest in sth. 对……表现出/有/产生兴趣
例：She has a strong interest in environmental protection.
§lose interest in sth. 对……失去兴趣
例：He gradually lost interest in playing video games.
§with interest 有兴趣地
例：The students listened to the lecture with great interest.
2.表示“爱好；感兴趣的事物”（可数名词，常用复数形式interests）
o含义：指具体的喜好或热衷的活动。
o例：His interests include reading, hiking, and playing the piano.
o固定搭配：sb.’s varied/wide interests 某人广泛的爱好
3.表示“利益；利害关系”（可数或不可数名词）
o含义：指个人或群体的权益、好处。
o常用搭配：
§in the interest(s) of sth. 为了……的利益
例：We must work hard in the interest of national development.
§protect one’s interests 保护某人的利益
例：The organization aims to protect consumers’ interests.
§have an interest in sth. 与……有利益关系
例：The company has a direct interest in the project’s success.
4.表示“利息”（不可数名词）
o含义：指借款或存款所产生的收益。
o常用搭配：
§pay interest on sth. 为……支付利息
例：Banks pay interest on savings accounts.
§high/low interest 高/低利息
例：This loan has a high interest rate.
二、作动词的用法
1.表示“使感兴趣；引起……的关注”
o基本结构：interest sb. (in sth.)
o例：The documentary interested her in marine biology.
o被动语态：be interested in sth. 对……感兴趣（形容词化表达，见下文）
三、常见固定搭配与短语
1.in the interest of：为了……；为了……的利益
例：In the interest of safety, please wear a helmet.
2.with interest：有兴趣地；附加利息地
例：I’ll pay back the money with interest next month.
3.lose interest：失去兴趣
例：Children often lose interest in toys quickly.
4.take an interest in：对……产生兴趣
例：Parents should take an interest in their children’s education.
5.places of inerest 名胜古迹
It is a beautiful city, it has many places of interests.
四、易混淆点辨析
·interested vs. interesting：
ointerested（形容词）：修饰人，表示“感到感兴趣的”，常用搭配 be interested in。
例：She is interested in classical music.
ointeresting（形容词）：修饰物，表示“令人感兴趣的”。
例：It’s an interesting book about ancient history.
五、用法注意事项
1.表示“兴趣”时，interest为不可数名词，但表示“爱好”时常用复数interests。
2.动词interest的主语通常是事物，宾语是人，即“事物使人感兴趣”。
3.利息（interest）为不可数名词，没有复数形式。
以上从名词、动词、固定搭配等角度系统梳理了interest的核心用法，涵盖日常语境、经济领域及情感表达等场景，可根据具体语境灵活运用。
