At 9:00 I called my dad to see if could come over after work. When he answered the phone, I just said, 'dad, can I come over after work tonight?

在九点的时候我打电话给父亲问问能不能下班后去看他，当他接电话的时候，我只是说：老爸，今晚上下班后我能到你哪儿去吗？

youdao

I'd be glad if you could help me.

你若能帮助我，我会非常感激。

《牛津词典》

I was just wondering if you could help me.

不知你是否能帮助我。

《柯林斯英汉双解大词典》

No one knew if they could get the spacecraft back to Earth, or if they could survive long enough to return.

VOA: special.2009.07.22

And if you could change the gene and make people not gay in the womb should have been done.

如果人们能够改变这种基因,让同性恋们在母体内就改变性取向,那么这种认定就应该进行。

普林斯顿公开课 - 人性课程节选

If I could do that for the rest of my life, get paid to talk all day, I would love to.

如果我的余生能够通过说话来赚钱，我非常愿意这样做。

想成为配音演员 - SpeakingMax英语口语达人

Prof Mark Cook, from the University of Melbourne, said if the technology could be proven if could help remove the unpredictable nature of epilepsy.

BBC: Brain implant 'predicts' epilepsy seizures

It could be a potential gold mine if developers could find a way to extract it and if regulators could appease the environmental community there.

FORBES: California's Clash: Shale Oil or Green Energy

Finally on Wednesday, if could not take it any more.

FORBES: Headed For A Danger Zone