Yaoming has been a professional basketball palyer.与Yaoming has become.
问题描述：
Yaoming has been a professional basketball palyer.与Yaoming has become.
Yaoming has been a professional basketball palyer.与Yaoming has become a professional basketball palyer.有什么区别
答
前句说“姚明已经是一个专业的篮球运动员”表状态,后面可与一段时间连用.如：Yaoming has been a professional basketball player for three years.
后句说“姚明已经成为一个专业的篮球运动员”表动作,不与一段时间连用.
*be动词一般表状态,是可持续的,而become是个瞬间动词.