The tú negative command is a form of giving commands in Spanish, and it is formed by using the present subjunctive. Let's analyze each command given:
1. No vienes tarde a la fiesta.
- Incorrect
- The correct negative tú command form should be: ¡No llegues tarde a la fiesta! (Don't arrive late to the party!)
2. No tomes el último trozo de pizza.
- Correct
- This sentence is already a correct negative tú command: "No tomes el último trozo de pizza." (Don't take the last slice of pizza.)
3. No tengas tanta prisa.
- Incorrect
- The correct negative tú command form should be: ¡No tengas tanta prisa! (Don't be in such a hurry!)
In summary, out of the given sentences, only the second one "No tomes el último trozo de pizza." is a grammatically correct tú negative command. The other two sentences need adjustments to form the commands correctly.