If she had known what lay in store for her, she would never have agreed to go.

要是她事先知道会有什么遭遇的话，她是决不会同意去的。

《牛津词典》

If she had known she would not have snapped.

如果她早知道，她就不会发脾气了。

youdao

She said she would never have bought an Italian style dress if she had known Mary had already got such a dress.

她说，如果她知道玛丽已经有了一件意大利风格的裙子，她就不会买了。

youdao

Missus Obama joked that if she had known, she would have picked a higher number.

VOA: special.2010.05.28

She says if she had known this would happen, she would have told her husband not to side with the independence movement.

VOA: standard.2009.09.07

Today, Suarez says she would have let the man off the hook if she had known he was Secret Service.

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She also said that she would not have told police about the incident if she had known the men were agents, and that their behavior hypothetically could have put the agency's work at risk.

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Asked by defending counsel John Kelsey-Fry QC if she had known the knife had gone into Mr Cressman she said yes, but she denied stabbing him or intending that the knife should go into him.

BBC: Aide's boyfriend 'sent explicit e-mails'