over做介词表“超过”时，可用more than代替

例：he has stayed here over a year.

= he has stayed here more than a year.

(他已待在此地一年多。)

he has stayed here more than over a year.(x)

he has stayed here much over a year.(×，much应删除)

over five students are here.

= more than five students are here.

(这里的学生有五人以上。)