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.
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