half

单复数都可以。Half of…作主语，谓语动词用单数还是复数与half of后所接名词的数有关。

例如：Half of it was damaged. 它的一半都被损坏。

Half of them are there already. 他们一半人都已到达那里。

Half of the cake is given to the children. 蛋糕有一半都给了小孩子们了。

Half of the students have failed in the exam. 有一半的学生没考及格。

Half 单独作主语，谓语动词用单数还是复数与half 本身所指代的名词的数有关：

Of the people who work here, half are French and half are English.

All the money is here—half is for you and half is for your brother.