Just try it. / Just give it a try. / Come on, try it. 试试看。

 

You can do anything if you really want to. 只要你想做，你就一定能做得到。

 

Come on! / Cheer up! 打起精神来!

 

Do your best! / Do a good cheer! / Beat your brains out. 尽力去做。1. Don't worry, be happy!

 

别担心，快乐点!