He is not fit to be a lawyer.为什么用被动式?to be 的主逻辑主语是什么呢?

He is not fit to be a lawyer.为什么用被动式?to be 的主逻辑主语是什么呢? He is not fit to command others that can not command himself The water is not fit to drink为什么不用to be drunk? the food is not fit to eat he is not what he used to be 为什么不能how he used to be He eat to mach.Eat to much is not good for his health,so he is（） 选项：healty fit thin fat000 his lauguage is not fit ___ because it is too full of swear wordA to be repested B repeated不明白为何用To be 形式 英语翻译that is not fit to the old people in this country 除了be fit to 还能用什么比较好?这里的fit要加ing么,这里我感到很奇怪,fit在这里是动词,但be fit to 又是固定搭配?如果这是雅思作文中我想表达这 像这个：He is not ( ) he was 或者是he is not ( ) he used to be.是选填who还是what? All he advised to us___that the meeting___todayA:is;not be held B:is;is not held 英语翻译My ConfessionI think everything will be thinking as I continue,but I was wrong.He is not fit me,perhaps I should have told him clearly,he should not be dragged on for so long,I am really doing a great disservice to him,I really deserveto he is not fit to command others that cannot command himself请解释一下这句子还有这句子的结构啊为什么that不是修饰others 呢 He is not ----he used to be .(用that 还是what)解释 He is not what he used to be ten years ago. He is not sure whether he will be to write a Book同义句,用certain he is not such a fool as you assumed him to be.to He is not the man ____.是选to trust 还是to be trusted为什么 He is not the man_______.是选择to trust还是选择 to be trusted为什么?