caused by和be cause by的区别

无be cause by这种用法,应为be caused by。caused by为过去分词（属于非谓语动词）,不可用于句中做谓语,只可做后置定语。be caused by为谓语动词,直接用于句中做谓语。例：Lung cancer can be caused by smoking。Lung cancer caused by smoking is a deadly disease。