The best translation for 'I'm coming back tomorrow' is 'O Regreso mañana.'
O Regreso mañana.
The best translation of the sentence 'I'm coming back tomorrow' is O Regreso mañana, which means 'I return tomorrow' in Spanish. 'Regreso' is the first person singular form of the verb 'regresar' (to return), and 'mañana' means 'tomorrow.'
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