Your American teacher introduces you to his friend. What do you do? Teacher: This is my friend, Frank.
Wai and say, “สวัสดีค่ะ/ครับ ยินดีต้อนรับค่ะ/ครับ”
Wai and say, “How are you, sir?”
Shake hand and say, “Nice to meet you.”
Shake hand and say, “สวัสดีเด๊ออ้าย”