1.Complex sentence structure: "I believe it really depends on the complexity of the song or poem" uses a complex sentence structure to express a nuanced opinion, demonstrating advanced grammar skills.
2.Contrastive conjunction: "On the other hand" introduces a contrastive idea, effectively comparing the abilities of children and adults, showcasing the ability to use conjunctions to create complex sentences.
3.Noun phrase as subject: "the level of interest in the content" serves as the subject of the sentence, using a complex noun phrase to describe a key factor, enhancing the depth and complexity of the expression.
4.Modal verbs: "can excel in learning" uses the modal verb "can" to express ability or possibility, adding nuance and flexibility to the sentence.