请教一个英文用词，“老板没有要求但我「主动」做了” 可以用 voluntarily 这个词吗？

可以啊。其实你那句话除了有“主动”，“自愿”的意思外，还包含了“无偿”的意思。老板肯定喜欢得不得了。

主人翁精神译过去是 sense of ownership ，和自愿不一样。

@SpicyCat 嗯嗯嗯，反应过来了， voluntarily 的确有无偿奉献的意思😄

I did xx without my manager ask ，不知道这句有语病不？但好像不够简洁

说出你的故事

spontaneously

Although it's not required, but I still wrote the documentation for this project, a proper documentation is always benefits to maintenance.

The documentation is not required by my boss, but I wrote it spontaneously.

@allan888 发了以后看了看还是一种莫名的 chinglish ，楼主随便做个参考吧。。。。

@Tonni 标准！感谢！

@Tonni 提两个语法上的问题 一是有了 although 就不要用 but 二是 be benefits to 是不对的

老板说这个项目不用加班到 12 点，但我还是「主动」加了😄

google 翻译，貌似也很有参考价值
The boss did not ask but I took the initiative to ...

initiative

proactively

本不应该做而做了 shouldn't have done sth

@Shura #16 shouldn't have done sth 有消极意思，就是后悔做了某事

on your own initiative

其实我觉得不翻译出来都行，本来就是主动语态，加上前半句都说了老板没要求

lol 这个句子用大词儿反而会词不达意

用 anyway 反而是最好的

No one asked for the documentation for this project, but i wrote it anyway.