自信的英语是：be sure of oneself。

一、短语搭配

1、自信心

self-confidence

2、激发自信心

inspire confidence (in sb)

3、过分自信

be overconfident; be overly confident

4、民族自信心

national confidence

5、恢复自信

restore one's self-confidence

二、双语例句

1、他很腼腆，需要增强自信心。

He is shy and needs building up his confidence.

2、比赛前他显得松弛而有自信。

He appeared relaxed and confident before the match.

3、自信心是一种宝贵财富。

Self-confidence is a precious/valuable possession.

4、你别太自信了。

Don’t be too confident of yourself.