Since the day before yesterday.
从前天开始的。
I should be tired since the day before yesterday my life.
前天应该是我长这么大以来最累的一天吧。
I see him the day before yesterday, but have not see him since.
前天我见过他，但后来再没见过他。
He has tasted no food since noon the day before yesterday.
他从前天中午起，就没有吃东西。
I saw him the day before yesterday, but have not seen him since.
前天我见过他，但后来再没见过他。
I saw him the day before yesterday, but have not seen him since.
前天我见过他，但后来再没见过他。
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