人称代词有主格和宾格两种形式，主格形式在句子中做主语，宾格形式在句子中做宾语，人称代词we是主格形式，它的宾格形式是us。We are teachers. They helpus study. 物主代词也有两种形式，形容词性物主代词和名词性物主代词。形容词性物主代词后面要加名词，而名词性物主代词后不加名词。we 的形容词性物主代词是our .名词性物主代词是ours. These are our books. These books are ours.