I don't know why I do it. I just do it.

尽管我不知道这样做的道理，我仅会模仿着做。

youdao

I just do it to conform.

我这么做只是随大流。

youdao

I never measure rice and water when I'm cooking - I just do it by rule of thumb.

我做饭时，从不量米量水，只凭经验。

youdao

I don't know why I do it. I just do it."

VOA: special.2009.07.04

I do it every week. It just so happens that this argument is more closed, more settled, in my own mind.

我每个星期都这样做，只是现在这个讨论,在我心中，是更不公开的，更稳定的。

耶鲁公开课 - 1945年后的美国小说课程节选

Like I said, basically it's just asking permission to do something or asking for somebody else to do something.

就像我说的，这个句型的基本意思是征求做某事的允许或请求他人做某事。

Would you please 课堂 - SpeakingMax英语口语达人

Generally speaking I just do it for expenses.

BBC: NEWS | Programmes | More Or Less | The numbers behind the survey

What McDonalds is saying is that if I want a Big Mac I can just do it myself.

FORBES: How To Make A Big Mac At Home

"I'd like to think that I would do it just like I would scratch if I had an itch, " says Louis-Dreyfus.

FORBES: Why not a sonnet?