Yaoming has been a professional basketball palyer.与Yaoming h
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
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.