Half后面可不可以连用of,如half of students

Half后面可不可以连用of,如half of students half of the students half students和half of the students有什么区别 half of students为啥不说a half of half与half of, Half of the students ____ from Beijing. half of the students 还是one-second of the students Half of the students ___from China and half of the food __fr half kilos of rice half of + 不可数 Half of _____is seven. Six is half of ( ).