一般的"加油" 英语怎么说，不是运动场上

cheer up!
go ahead!
try your best!

如果是普通的在加油站加油，那是fuel。比如：
所有飞机飞行前都必须加油。
All aircraft must fuel before flight.
他无动於衷使她心中的怨恨火上加油.
His indifference was a fuel to her hatred.

如果是鼓励人的那种加油，那有两种：
1. to make an extra effort
例如：如果你想做出点成绩来，那你要好好加油了。
If you want to have much success, you need to make an extra effort.

2. to cheer for 或 cheer sb. on
例如：他们大声地为自己的足球队喊加油。
They cheered loudly for their football team.
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.
The crowd were cheering their favourite on, willing her to win.

英国人喜欢说CHEERS！
已经不单有加油、干杯的意思了，当你买完东西，店员递给你的时候，你就可以说个CHEERS！包含谢谢，再见等意思……用途相当的广

cheer，make an extra effort，play up，put on steam，fighting
More power to you.
加油。

Come on 是最口语化的，当说话双方关系较密切，经常用。

fighting!作用于学习，生活中最广泛的加油！