take an interest in someone or something 是正确的 对.感兴趣 例句: Do you take an interest in your children? You should take an interest in everything your child does. have interest in 也是对的,但have an interest in更常用.因为interest当兴趣用时既有可数名词又是不可数名词.可数名词更常用 例如:I've always had an interest in astronomy.(对) He never seems to show any interest in his children.(也是正确的)