序数词前不加the的三个例外

1、序数词前有形容词性物主代词。如：my first time。

2、序数词前有名词所有格形式。如：Tom's third car。

3、不表示顺序，仅表示再一，又一意思时。如：The rich man has bought two cars But he wants to buy a third one this week。