If only I could have helped put matters right.

要是我当时能帮着把错误纠正过来就好了。

《牛津词典》

If only I could have a girlfriend.

如果我能有一个女朋友就好了。

youdao

If only I could have gone to the movies.

要是我去看了那部电影该多好！

youdao

There was nothing I could do. When you have this kind of a problem, you can only take care of your body.

VOA: special.2010.08.09

I could have just done this, and the only reason I didn't here is just because now I look - at this, and now it's just getting confusing for me -- even for someone who's been programming for a while.

我本可以这样做，我之所以没有这样做是因为,现在我看着这个，它是我有点迷惑了-,甚至是对于某些已经写了一段时间程序的人来说。

哈佛公开课 - 计算机科学课程节选

This fellow wrote: I should be very ashamed were I to fall and people have to help me and realize that I could see only very little.

他这样写道：,当我跌倒了人们要帮助我的时候,或者我意识到自己只能看到很少东西的时候,我会感到很羞愧。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

"The only way I could have beaten her would have been if someone was holding her down, " says the billionaire.

WSJ: Social Media

Jay told me I could only have four.

WHITEHOUSE: Press Briefing

Self-Awareness: If I could only choose one attribute to have, I would choose self-awareness.

FORBES: Golf: The Game Of Life