Could you confirm whether both of the sentences are right and natural in each following pair? Thank you.<br/><br/><i><b>1A. He left two days before yesterday.</b></i><br/><i><b>1B. He left three days ago.</b></i><br/><br/><i><b>2A. He is leaving two days after tomorrow.</b></i><br/><i><b>2B. He is leaving three days later.</b></i>