There are 50 students in our class ,____girls.爲什麼可以填half of

題目：

There are 50 students in our class ,____girls.爲什麼可以填half of then不可填half of girls
不好意思，打錯了，是爲什麼可以填half of them 而不可以填half of whom且爲什麼老師說添half of whom後面要加are?而爲什麼half of them 後面不需要呢？

解答：

50 students 包括男生和女生,half of them 中 them 代指50 students.half of girls就默認 50 students全部爲女生
再問： 不好意思，我打錯了，是爲什麼可以填half of them 而不可以填half of whom且爲什麼老師說添half of whom後面要加are?而爲什麼half of them 後面不需要呢？
再答： half of whom，後接賓語從句，後面要加are half of them，與girls是同位語，所以不要加are