interested: 都可作形容词用。Interesting指有趣的、令人感兴趣的。Interested 指感兴趣的，主语通常是人。事实上，这一类使动用法的动词都有这样的特点。加-ed一般都表示感到……;加-ing则表示令人……的。类似的有excite; surprise; satisfy等等。
interest:可以作动词，也可以作名词。
interest:
(1) n. 兴趣；关心
wanting to know or learn about something or someone because it is important to you
[例句]
The book caused great interest and argument.
这本书引起了人们极大的兴趣和争论。
He read the news with interest.
他津津有味地读了这一消息。
I have not the least interest in your plan.
我对你的计划一点兴趣都没有。
(2) n. 爱好；感兴趣的事
a hobby;something you are interested in
[例句]
Photography is my chief interest.
摄影是我主要的爱好。
He has two great interests in life
他生活中有两大兴趣：音乐和绘画。
(3) n. 趣味
the quality of exciting interest
[例句]
Suspense adds interest to a story.
悬疑增加了一个故事的趣味。
This subject has no interest to (for) me.
这题目对我来说没有什么趣味。
(4) n. 影响；控制力
personal influence over the actions of others,controlling power
[例句]
His speech will have interest with us.
他的报告将对我们产生影响。
(5) n. （商业，产权之）股份
a share or right (in a business, property)
[例句]
He has an interest in the business.
他在该商店中有一股份。
(6) n. 利润，福利，利益，好处
profit,benefit,advantage,good
[例句]
He always puts the interests of the people before his own.
他总是把人民的利益置于个人利益之上。
(7) n. 利息
payment made for the use of money
[例句]
He lent me the money as 5 percent interest.
他以五分的利息借我一笔线。
I repaid him with interest.
我连本加利偿还了他。
(8) v. 使…感兴趣，引起关心
make someone want to know more about it or him
[例句]
I talked to the sailor for a long time because he interested me.
我和那个水手谈了很久因为他使我很感兴趣。
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