记得要对自己有信心。

Jìde yào duì zìjǐ yǒu xìnxīn.

Remember to have confidence in yourself.

你有信心会赢这场比赛吗？

Nǐ yǒu xìnxīn huì yíng zhè chǎng bǐsài ma?

Are you confident you'll win the competition?

只要有信心，你就能学好中文。

Zhǐyào yǒu xìnxīn, nǐ jiù néng xuéhǎo Zhōngwén.

As long as you have confidence, you can learn Chinese well.