现在完成进行时的结构是：主语+ have/ has been + doing sth .如：He has been learning English for three years .当be 动词需要表示完成时就用：主 + have / has been + 其它 .如：He has been here for two days .!
现在完成时什么时候加been,什么情况加
现在完成进行时的结构是：主语+ have/ has been + doing sth .如：He has been learning English for three years .当be 动词需要表示完成时就用：主 + have / has been + 其它 .如：He has been here for two days .!