เมื่อเจอเพื่อนจะโบกมือทักทาย แต่ถ้าหากเป็นผู้ใหญ่จะโค้งตัวลงประมาณ 45 องศา when you meet your friend then you greeting by "wave" but you meet the adult then you greeting by bend down.
I have never been disappointed in your own, and it's proud of you most. So you don't have to feel guilty. Don't apologize anymore, take care of yourself and eat as much rice as my happiness is.