cause和caused的区别 caused by还是cause by

cause和caused的区别 has cause中cause是名词 has cause中caused是动词 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 smoki