Put the statenents in pastunreal conditions 1:Oanh didn't know how to solve the maths probrem so she got low marks
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1:Oanh didn't know how to solve the maths probrem so she got low marks
=> If Oanh had known how to solve the maths probrem, she would not have got low marks
#NoCoppy
=> If Oanh had known how to solve the maths probrem, she would not have got low marks.
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