Be careful using this grammar when speaking to people older than you, or in a higher position as it can be offensive.
Don't do~
[อย่า]+verb(+object)
1.Don't go.
อย่าไป
2.Don't go buy a book.
อย่าไปซื้อหนังสือ
Do~
verb(+object)+[สิ] Order
Go!
ไปสิ
verb(+object)+[หน่อย]+[สิ] Request
Could you go?
ไปหน่อยสิ
