1、confident作形容词，意为自信的，有把握的。2、confident作名词，意为信心，信赖。词组：be confident of、be confident about或be confident后接that从句。

例句：

1、He is confident of getting the first place.他确信拿第一。2、He is quite confident that he will pass the examination.他很有信心通过考试。3、He lacks confidence in himself. 他缺少自信。