The expression is fine and very commonly used.
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Anonymous" The day before yesterday " , it is used more in Reported Speech when we have in sentence Yesterday , e.g : I saw Mary yesterday (Direct Speech) : She said she had seen Mary the day before yesterday (Reported Speech)No. That's not right.
Anonymous Erm... CalifJim, "On the previous day" and "the day before" are both grammatically correct but they change the content of the actual message. For example, if I am speaking today about something that transpired on the previous day or the day before, then it stands to reason that the action took place yesterday. "The day before yesterday" is perfect grammar and, a