opposite 词性比较复杂,
He suddenly doubled and ran in the opposite direction.他突然转身,朝相反方向跑去（形容词）
Melissa slid in beside Paula,and her husband sat opposite.
梅利莎悄悄溜进来坐在葆拉身边,她的丈夫在对面坐下.（副词）
Jennie had sat opposite her at breakfast.珍妮吃早餐时坐在她对面.（介词）
Marius was the opposite （名词）