1.Modal verbs: "Advertisements can indeed have a positive impact on children" uses the modal verb "can" to express possibility, adding nuance to the statement.
2.Relative clauses: "Educational ads, for instance, can inform them about innovative products or services that could be beneficial" uses a relative clause "that could be beneficial" to provide additional information about "products or services", enhancing the complexity of the sentence.
3.Present participle phrases as adjectives: "broadening children's horizons" uses the present participle "broadening" as an adjective to describe the effect of advertisements, showcasing advanced grammar usage.
4.Infinitive phrases as adverbials: "to be entertaining and engaging" uses an infinitive phrase as an adverbial to describe the purpose of some ads, adding depth to the sentence structure.