take interest in 和take an interest in 有什么区别

take interest in 和 take an interest in 的区别在于语义表达。
take an interest in 是习惯用法（idiomatic usage），有固定的词义：对（某事/某人）有兴趣，表达关注，相当于 be interested in。而 take interest in 不是惯用法，只是因语义表达需要而将单词用在一起：从（商业利益）中收取利息。这个表达方式中的 interest 是不可数名词，通常用来表达从投资或银行存款中获取的利息。例：
You should take an interest in everything your child does. 你应该关注你孩子所做的每件事。
I have/take interest in a restaurant. 我从一家餐馆获取利息/利益。
需要注意的是，take an interest in 在某些特定的语境中会将 an 省略，比如：
He lost his interest in life long ago. Wealth, love, and happiness meant nothing to him. He took interest in neither of them.
上例中的 took interest in 用于否定语义的句子中（= He took no interest in them）。

一般都是要加不定冠词的,除非interest前面有其它的形容词,比如：little, special..
所以take an interest in可以用,但我们不用take interest in ,
但可以说take little(special) interest in

一般都是要加不定冠词的,除非interest前面有其它的形容词,
比如：little, special..
所以take an interest in可以用,但我们不用take interest in ,但可以说take little(special) interest in

一般都是要加不定冠词的，除非interest前面有其它的形容词，比如：little, special..
所以take an interest in可以用，但我们不用take interest in ，但可以说take little(special) interest in