1. Present simple tense: The answer uses the present simple tense throughout (e.g., "the main aim of punishment is...", "it helps them understand..."), which is appropriate for stating general truths and opinions.
2. Infinitive of purpose: "to teach a lesson" and "to make better choices" use the infinitive form to clearly express purpose.
3. Complex sentences: The answer uses complex sentences with subordinate clauses, such as "When someone is punished for doing something wrong, it helps them understand the consequences..." This shows a good command of linking ideas.
4. Passive voice: "When someone is punished..." uses the passive voice, which is suitable for focusing on the action rather than the doer.