Tri Duc English - Unit 68 👋 TRI ĐỨC ENGLISH 2026 • Pre-Intermediate UNIT 68 Greetings & Farewells LÝ THUYẾT GIAO TIẾP A. Greetings Chào hỏi (Saying hello): Formal: Shake hands & say "Hello, nice to meet you." Informal: "Hi. How's it going?" / "How are things?" Reply: "Not (so) bad, thanks. And you?" B. Farewells Tạm biệt (Saying goo...