Here someone asked me something that I don't know and I want to tell him that "if I had known I would not have asked"
Which one is grammatical.
If I had known I would not have asked.
If I had known I wouldn't have been asked.
If I had known I would not have asked. More colloquially: If I'd known I wouldn't have asked.
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If I had known I would not have asked.
More colloquially:
If I'd known I wouldn't have asked.