我相信你可以的！用英语怎么说

I belive that you can do it.

I do believe you can!
I swear to you that you can!
I swear to you that you can make it!
Bet you'll make it!

I belive you can make it. 书面 或者口语都可以
I bet you can!口语化

但是常用make it 而不是用do it
所以 you can do it 的说法不纯正。

I think you can／may／will

I believe you can／may／will

I bet u can!比较口语话 翻译:我赌你行~

I belive you can do it well!