Order the grammatical structures based on their description and example:
1️⃣ Verb conjugations: Indicates subject, tense, and mood (e.g., "Ich spreche" vs. "Sie sprechen")
2️⃣ Case usage: Differentiates roles of nouns and articles (e.g., "Der Mann hilft dem Kind")
3️⃣ Word order: Affects meaning and emphasis (e.g., "Er hat das Buch gelesen")
4️⃣ Pronouns and articles: Refer to people and things (e.g., "Er ist mein Freund")