Would you have gone the Party you the u was there? We normally use third conditional sentences to talk about how things could have been different in the past, i.e. for hypothetical imaginary situations. Compare: Yesterday I got up late and missed my train. the real situation. Ihadn't got up late yesterday, I wouldn't have missed my train. the hypothetical or imaginary past situation)
To make a third conditional, use if past perfect and would have past participle.
The contraction of both had and would is'a.
We can use could instead of would to make the result less certain If shed studied harder, she might have passed the exam Match the phrases.