beafraidnot恐怕不是这样,believenot我想不是.这两种说法是正确的.在这两个结构里,not可以看成是一个句子在具体环境下的省略形式,表示否定.如“1.—HasTomfinishedhishomework?—I'mafraidnot.在这里,I'mafraidnot就相当于I'mafraidhehasn'tfinishedhishomework.2.DoyouthinkIcanfinishthetaskinafewminutes?—Ibelievenot.我不这么认为.在这里,Ibelievenot,相当于Idon'tbelieveyoucanfinishthetaskinafewminutes.