be confident in等于be confident about吗

不完全等于，两者意思都是表示对……很信任。

区别在用法上：

be confident in ***/doing sth，后面可以加人。

be confident about dong sth/sth，后面不可以加人。

例句辨析：

①be confident in

Students are suggested to be more confident in themselves and try to grasp everychance to practise speaking English in daily life.

学生应该加强自信心，在日常生活中抓住练习英语口语的机会。

②be confident about

Be confident about your ability in achieving your goal, and be sure of your strongwillpower and your endowment in language.

要确信自己必定能到达目标，深信自己有顽强的意志和语言方面的能力。