1.Relative clause: "When participants know there's a reward at the end" uses a relative clause to provide additional information, adding complexity and depth to the sentence.
2.Present participle as an adjective: "engaging and thrilling" uses present participles as adjectives to describe the event, enhancing the expressiveness of the language.
3.Noun phrase as subject: "Offering prizes in competitions" serves as the subject of the sentence, demonstrating the ability to use complex noun phrases effectively.
4.Causative structure: "providing a significant boost to their enthusiasm and commitment" uses a causative structure to explain the effect of prizes, showcasing advanced grammar usage.