加油用英文表达是：come on；
come：int. (鼓励某人要有理智或通情达理，或表示不太赞同)嗨，得啦，好啦。
on：adv. 表示持续性; 向前(移动); 穿在身上; 穿着; 戴着。
（图片来自网络侵删）
Come on, now ─ be a man.
快点儿，像个男子汉的样子。
Come on, you two, fight fair!
得了，你们俩，要按规则比赛！
I can't come on that date.
那个日子我来不了。
Oh you're so slow; come on, hurry up!
哎哟，你可真慢；加把劲，快点！
How much is it going to cost, then? Come on, hit me with it!
那么它究竟要花费多少钱？快点告诉我吧！
Come on, don't fib! Where were you really last night?
得了吧，不要撒谎了！昨夜你到底在哪儿？
