英语语法：I worry about和I am worried about的差别是什么,

英语语法：I worry about和I am worried about的差别是什么,1.I worry about that she is too consummate but are envied by person really.我的理解：I是主语；worry about作为谓语动词； that从句作为宾语.2.I am worried about that he has not recovered yet.我的疑问：对于第2句话：I是主语,am是系动词吗?worried about that he has not recovered yet整个这句话是作为形容词吗?类似的词还有 I afraid about; I am afraid about等等.