"I believe you can do it""I believe in you"believe 改成 trust 也行, believe更常用.
geniyu都说了...不过我还想到个you can do it! I have faith in you.
You can make it .do 表示做,make 表示做成,例如:I made it .我成功了。
i believe i can do .
我相信你一定能行ibelievethatyoucandoit.