their father takes them to school中的take为什么要加S 有没有不加的例句?

father是第三人称单数，要加s，若改为fathers则不加s.

这个句子的时态是 一般现在时态，
而主语their father 又是第三人称单数，
所以动词 take用“第三人称单数形式”，
后面加s
当主语是不是第三人称单数，即“第一人称”、“第二人称”、“第三人称复数”时，动词后面就不用加s，如：
I take them to school.
You take them to school.
They take them to school.

第三人称单数当然要加S拉~
You take them to school.

their father 是单数形式
Their fathers take them to school

their father是一个人,当然用单数第三人称,加S.
不家S,应该是复数,一般现在时
Their fathers take them to school.

their father是单数第三人称，在一般现在时中，单三的后面动词要加s,因此是：
their father takes them to school

their father 是一个人，用take 的第三人称单数。
例句：their sisters take them to school. sisters是复数所以用take原形。

他们的父亲,是第三人称单数,因此take要加s
第一人称、第二人称和复数不加s,比如：
their fathers take them to school
I take them to school

如果他们的父亲是一个人的话就一定是单数，那就应该用第三人称单数，加s

father是单数啊
不加s
i take you to school