Question

Bring me a glass of water it's change in to question tag
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Answer 1

Answer:

when u will bring me a glass of water?

Answer 2

Answer:

Bring me a glass of water, will you?

// Here, bring me is an order which is given to another person. So, for the tag question, we use 'will you'. This also means you're asking whether the person will bring it or not //