offer 指“提出,提供,呈现”,表示向别人提供可接受也可拒绝的某物,如帮助、服务或物品,例如：He offered me a job,but I didn't accept.
provide 指“供给,提供,装备,准备”,通过储存或准备的方式为某事做准备,以在需要时提供所需物品.例如：We provided them (with) board and lodging.
supply 指“供给,补充,弥补”,意为“供给（量）,物资,存货”.例如：We are well supplied with foods.