have faith in 对...有信心，信念，信仰

have no faith in 不信任

I have faith in his ability to success.

我相信他能够取得成功。

Have faith in your judgement.

要相信你的判断。

A:I don't know if I can do this.

我不知道我是否可以做这个。

B:I have faith in you.

我相信你。

A:You do?

是吗?

B:Yeah,you're really hard-working.

是的，你真的很努力。