To tell someone to do something, du‑st off the sentence — in other words, take away the du and the ‑st!
| Du trinkst kein Bier. You drink no beer. |
Trink kein Bier! Drink no beer! |
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You’ll sometimes see an ‑e added to the du command (for example, Trink! and Trinke!). Don’t worry, the meaning is still the same.