before yesterday是一般过去式的标志。
例句：
She reached Paris the day before yesterday.
她前天到达巴黎。
The day before yesterday, he went to America.
前天，他去了美国。
扩展资料
The day before yesterday, she aired the room.
前天，她给房间通风了。
His grandfather died the day before yesterday.
他的祖父前天去世了。
The accident happened the day before yesterday.
事故发生在前天。
