Final answer:
To create negative tú commands, use the yo form of the verb in the present tense and add -es or -as. For affirmative tú commands, use the él/ella/usted form of the verb.
Step-by-step explanation:
To create negative tú commands, you typically take the yo form of the verb in the present tense, drop the -o ending, and add -es to -ar verbs or -as to -er and -ir verbs. For example, with the verb 'hablar', the negative tú command would be 'no hables'.
For affirmative tú commands, you generally use the él/ella/usted form of the verb in the present tense. For example, with the verb 'comer', the affirmative tú command would be 'come'.