我很努力了英文

您的问题很简单。呵呵。百度知道很高兴帮助您解决您提出的问题。原句：我一定会成功，因为我会很努力翻译：iwillbesuccessful,becauseiwillbeveryhard百度知道永远给您最专业的英语翻译。

I have tried all my best.

I've been trying hard

“我努力了”是pay my due pay one's dues Earn something through hard work,long experience,or suffering.For example,She'd paid her dues in small-town shows before she finally got a Broadway part.This expression transfers the cost of being a paid-up member in an organization to that of gaining experience in an endeavor.