1. Present continuous and simple present: "When kids act out being doctors, teachers, or superheroes, they create their own little worlds and storylines." This sentence uses the simple present to describe general truths and habits, which is appropriate for IELTS Speaking.
2. Infinitive of purpose: "fantastic for sparking children's imagination" uses the gerund form after a preposition, showing good control of grammar.
3. Causative structure: "helps them develop empathy" uses the verb 'help' followed by the bare infinitive, which is a natural spoken structure.
4. Present participle phrase: "by seeing things from different perspectives" uses a present participle phrase to explain how empathy is developed, adding complexity to the answer.