he is the best student among all.有人说among 后面不可以加all?如果among后面可以加all ,那可以直接加嘛?如he is the best student among all?

he is the best student among all.有人说among 后面不可以加all?如果among后面可以加all ,那可以直接加嘛?如he is the best student among all?
he is the best student among all.有人说among 后面不可以加all?
如果among后面可以加all ,那可以直接加嘛?如he is the best student among all?

he is the best student among all.有人说among 后面不可以加all?如果among后面可以加all ,那可以直接加嘛?如he is the best student among all?
all后再加一个名词,这句话就对了.