1. Third conditional


"If I would have known about the party, I would have gone to it."




This is INCORRECT, although commonly used, especially in American English.

The correct form is:

If + had + past participle, would + have + past participle

"If I had known about the party, I would have gone."

This is CORRECT.




:):):):)

If + had + past participle, would + have + past participle

i already use this structure my teacher learnt this

in any case,thanks Basem