Subject + 的 + 一半
一半 (yībàn) is a noun meaning "half" or "one half." It is used to indicate that something is divided into two equal parts, or that approximately fifty percent of something is being referenced. It can function as a subject, object, or modifier.
这块蛋糕我们一人吃一半吧。
zhè kuài dàngāo wǒmen yī rén chī yī bàn ba.
Let's each eat half of this cake.
工程已经完成了一半,预计下个月结束。
gōngchéng yǐjīng wánchéng le yībàn, yùjì xià gè yuè jiéshù.
The project is already half finished and is expected to be completed next month.
班上差不多有一半的同学去过北京。
bān shàng chàbuduō yǒu yībàn de tóngxué qù guò běijīng.
About half of the students in the class have been to Beijing.