1. Present simple tense: Used throughout the answer (e.g., "Speaking not only helps you remember vocabulary and grammar, but it also builds your confidence and fluency") to state general truths and opinions, which is appropriate for IELTS Part 3.
2. Not only... but also: This correlative conjunction structure ("not only helps you remember..., but it also builds...") adds complexity and variety to your sentence structure.
3. Relative clause: "which is really helpful for improving your pronunciation and learning natural expressions" uses a relative clause to give extra information, making the answer more detailed and fluent.
4. Infinitive of purpose: "to make the language a real part of your life" uses an infinitive to explain the purpose, which is a natural and effective way to end your answer.