on(在...上面) 用于正式语言交际场合.例如:put the knife on that table
on(在某一天等) on october 1.on weekdaye
of(表示所有关系或部分与整体关系) students of new china some of you
about(关于)用于非正式谈话中.This is story about Africa
for(延续多久,表示目的,为了,对象,适用于) for an hour
to(到) Are you going to the concert on sunday