肯定的吧of改为about也是一样的意思吗？意思是确信to呢？一定 语气更加确定be sure of:肯定的是……对吗？be sure of 确信例句：She looked over her shoulder to be sure of her footing. 她扭头看了看后面以确认自已是否站稳了。 be sure about 对......很有把握 例句： You can be sure about their interest in it. 你可以肯定他们对引很感兴趣。