If I would have known... VS. If I had known…

Question

I have used 'If I had p.p..., I would have p.p...' like If I had known you were a teacher, I would have asked some questions. However, I saw 'If I would have known...' structure like below

Elsa : I never knew what I was capable of.

Anna : I’m so sorry about what happened.
If I’d have known…

Elsa : No, no, no, It’s okay. You… You don’t have to apologize.
(Frozen)

And then can I also use "If I had known..." instead for the same meaning of If I’d have known…Or is there a meaning difference between them? What do you native English speakers think? Thank you so much in advance.

AlpheccaStars · Accepted Answer

Hans51And then can I also use "If I had known..." instead

No, it's not correct. (Edit: I mean "If I have known" and "If I have had known" are not acceptable in American English.)

Fivejedjon · Answer

Hans51Anna : I’m so sorry about what happened.If I’d have known… Elsa : No, no, no, It’s okay. You… You don’t have to apologize.(Frozen)And then can I also use "If I had known..." instead for the same meaning of If I’d have known…Or is there a meaning difference between them? What do you native English speakers think? Thank you so much in advance.

In British English, 'If I'd have known is taken to be 'If I had have known' which is considered sub-standard - though it's not uncommon in speech.

If 'I'd have known' is taken to be 'If I would have known', then that is considered incorrect.

The only acceptabl form in standard BrE is 'If I had ('d) known'

Hans51 · Answer

I mean "If I have known" and "If I have had known" are not acceptable in American English.)

Thank you so much and what does that mean? I think that we can make sentences with the expresstions or is it never possible with them, especially 'If I have p.p...'?
If I have known you well, I would....

AlpheccaStars · Answer

Hans51 I mean "If I have known" and "If I have had known" are not acceptable in American English.)Thank you so much and what does that mean? I think that we can make sentences with the expresstions or is it never possible with them, especially 'If I have p.p...'? If I have known you well, I would....

My earlier reply was hasty and unusually sloppy. Sorry for that.

The example you gave was an if- clause that is counterfactual in the past: If I had known you were sick, I wouldn't have bothered you. (I did not know that you were sick.)
In this construction, the past perfect is the correct verb form, not the present perfect.

In a few other if-clause constructions, the present perfect is OK. I can think of two off the top of my head:
1)
If I have known one bad deal, I have known a hundred.

I have known a lot of these. The if-clause is not counterfactual, it is a true statement, and used for emphasis.

2)
People sometimes ask me if I have known my friend since were were little.

An indirect question with if.

If I'd have known that earlier, I would have... = If I would have known. The contraction is common in speech.

CalifJim · Answer

Hans51If I’d have known…

This is a very common mistake made by native speakers, so you will hear it fairly often. I don't recommend imitating it, though. Say "If I had known" instead.

CJ

If I would have known... VS. If I had known…

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