Juan hizo las tortillas can be rewritten with the direct object pronoun as Juan las hizo, where 'las' replaces 'las tortillas'. The sentence 'Juan hizo las tortillas' can be rewritten with a direct object pronoun to replace 'las tortillas'.
The correct pronoun to use here is 'las', which is the feminine plural direct object pronoun in Spanish that agrees with 'las tortillas'. Hence, the sentence becomes 'Juan las hizo'. It is important to place the direct object pronoun before the conjugated verb in Spanish.
Understanding pronoun case is crucial for correct sentence structuring. The distinction between subjective case pronouns (I, we, you, he/she/it, they) and objective case pronouns (me, us, you, him/her/it, them) ensures that pronouns are used correctly depending on their grammatical function within a sentence.