beforeyesterday是什么時態

　　The day before yesterday, he went to America.

　　前天，他去了美國。

　　The day before yesterday, she aired the room.

　　前天，她給房間通風了。

　　The accident happened the day before yesterday.

　　事故發生在前天。

　　She visited the History Museum the day before yesterday.

　　她前天參觀了歷史博物館。