Notice that the tú command for ser is the same as the present tense yo form of the verb saber . Sometimes the context of the sentence will make it clear which of the two is intended; however, placing the subject pronoun after the command further clarifies the meaning. Notice in the following examples how using a subject pronoun will clarify these identical twins. • Sé tú un buen niño mientras tu madre va de compras. Be a good boy while your mother goes shopping. (affirmative tú command, ser ) • Yo sé la respuesta. I know the answer. (present tense yo form, saber) Negative tú commands The present tense yo form is the base for creating a negative tú command. Most verbs that stem
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