The search proved difficult.这句话为什么不用被动语态这句话为什么不用被动语态?如果用被动在proved前面加个was就可以了吧

翻译：The search proved difficult The search proved difficult和The search proved to be difficult有什么区别? The search proved difficult,为什么不是The search was proved difficult?the search 不是应该“被”证明很有难度吗?应该用被动语态才对? the search proved difficult ,这句话是怎么回事?difficult不是形容词吗?为什么可以这样用啊? the search proved difficult ,to mention imaginary ,为什么形容词difficult,imaginary可以修饰动词? 关于prove的问题The search proved difficult.的意思为什么是“事实上搜寻很困难”prove不是“证明”麽? 新概念第三册英第一课问题.The search proved difficult,for the puma was often observed at one place in the morning and at another place...difficult是修饰proved的吗? 为什么不是The search proved is difficult,这样的吗?没有BE动 英语翻译Befour - Comsic RideDum dam da di da di dai Dam da di da di dai I'm on my cosmic ride Dum da di da di dai Dum da di da di dai I'm gonna search the sky Cause i miss you so I'm gonna fly so high And i need you so Here on my cosmic ride I do The search proved difficult.这句话为什么不用被动语态这句话为什么不用被动语态?如果用被动在proved前面加个was就可以了吧 新概念英语第三册第一课1句子结构~The search proved difficult,for the puma was often observed at one place in the morning and at another place twenty miles away in the evening.只看句子前半段：the search proved difficult这句结 search search for in the search of 区别 search与search for区别?例如:search the bushes和search for the gun? search the information正确吗?只能用search the Internet? The search to find only in the search for lost columbus proved that the earth is round search search search