Question

trink Sie
(is it correct)

Answer 1

What's the question? No one can tell you if it's correct if we don't know the question or what you are trying to write.

Answer 2

I am not an expert in the language, but from what I can remember:

trinken Sie! if it is imperative, or
trinken Sie if it is present tense.

Perhaps Reiny can confirm or correct this response.

Answer 3

Trinken Sie! = imperative, when talking to a stranger (or adult, or boss, ...)

Trink! = imperative, when talking to a child, a friend, a family member, etc.

Sie trinken... = They are drinking

Sie trinkt = She is drinking


Hope this helps... :-D