0This is what I think. "If I had known" put you back in time to the point where you didn't know she would/wouldn't come. 0-
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10I'm just having trouble making sense of this at all. If I'd have known you were going to be 11u10so12u10 late, I never would have waited for you -- now that makes sense. If I'd know you were going to be only a little late, I would have waited for you. 12br
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01cite10New2grammar12cite11i11font10If I'd know12font10 you were going to be only a little late, I would have waited for you.12i12br
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11i10Is the highlighted phase short for If I would know or there's a typo and it's short for If I had known?12i12b
01cite10Grammar Geek12cite10 11i11b10If I'd have known12b12i10 you were going to be so late, I never would have waited for you12blockquote10That can't be a typo, although it could be a Freudian slip... if you really never say it