1.south是形容词或名词,the south名词,southern形容词
2.泛指哪方或方向时,不用the 如brought east and west closer
the earth goes from west to east
3.特指是哪个地区的哪方时,要用the
the south of China 华南地区
4.I remember he lives in the south,so we shouldn’t be walking west .中lives in the south特指住在哪,walking west 只是指方向.