倒..楼主你知道prove是个特殊的动词吗,可以当系动词,也可以当实义动词.第一个句子里面,prove是个系动词,即"被证为".举个例子,his answer proves right,即他的答案被论证为是对的.明白了吗?所以第一个be是现在进行时的be
第二个correct是做to be的表语,prove此时变成了实义动词.比如,his answer is proved (to be) right,这里的to be可省,省掉to be便成为了第二个句子的形式.
一个语法问题,However,rescue operations are proving difficult.其中was
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