them的主格是什么(them的动词原形)

them它在英语句子中是第三人称复数的宾格，它的主格是 they，它的形容词性的物主代词就是their，它的名词性的物主代词就是theirs.

例句如下

Jenny often help them to clean the classroom after school.

Their teachers teach them to do ith some problems.