sure与certain的用法区别详解 (1)be sure of和be sure about. be sure of(表示“对…..很确信/有把握”)和be sure about(表示“一定会干某事”)后面跟“连接词(疑问词、连词whether)+不定式”结构,意思是“确定……”. 例如:I’m not sure whether to go to the party. 去不去参加聚会我还不能确定. (2)be certain. ①和of(有时用about)连用,后接名词或动名词(用about时不跟动名词),意思是“确信”,只能用人作主语.如:He was too certain of her coming to send for her. 他相信她肯定要来,所以没有打发人去请她. ②后接从句,意思是“确信……,确定……”,只能用人作主语. 例如:I’m certain (that) he saw me.我确信他看见了我. ③后面跟“连接词(疑问词、连词whether)+不定式”结构,意思是“确定……”,只能用人作主语. 例如:They were not certain whether to go or not. 他们不能确定该不该去. ④表示“(某人做某事)肯定无疑的”时,要用It is certain that …句型(该句型中不能用sure, It is certain for sb. to do sth. 这样的用法是错误的.) 例如:It is certain that your team will win. 你们队肯定会赢. [注意]这一句型可以转换为:Your team is certain to win. / Your team will certainly win. 1. Wait till you are more .It’s better to be sure than sorry. A. inspired B. satisfied C. calm D. certain 解:答案选D.本题考查形容词的意义辨析.从下句的It’s better to be sure than sorry. 可以判断,此处应选certain,,句意为“等到你更确信,弄确定(不出错)比(没弄确定而出错)向别人道歉更好些”.其他选项不合句意. 2. Quite a few people used to believe that disaster if a mirror was broken. A. was sure of striking B. was sure of having struck C. was sure to be struck D. was sure to strike 解:答案选D. be sure of doing 表示“对…..很确信/有把握”;而be sure to do表示“一定会干某事”;而strike可作为不及物动词使用,表示“降临”,本句意思为:“过去许多人相信如果镜子了,灾难一定会降临”.