to make an extra effort:
例句: Your English is not good ,you should make a extra effort.  你英语不好,要加油哦

make an all-out effort:

fighting:
韩剧的比赛里经常用

come on:
或者GO! 一般在田径比赛中使用.  
加油，别灰心，别泄气，来吧，振作起来
例句: Come on,you can! 加油,你行的.

cheer on：
向……欢呼；为……鼓劲加油。
例句: The crowd were cheering their favourite on, willing her to win. 大家都在给他们心目中的热门参赛者加油, 暗使劲儿使之获胜.
he boys cheered their football team.男孩子们向他的足球队高呼加油

cheer up:
有叫某人振作起来之意, 在别人在失败时劝人振作

go ahead,

keep going!  

work harder!

play up!  
例句: Play up! It's your turn. 加油啊!轮到你了。

put on steam!
例句: I wish you happy and I hope you can put on steam with your dream. 祝你幸福，也希望你能为你的梦想加油