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[Sash]

Иван сказал, что я многое потеряла, что не пошла с ними на праздник.

[chetnik]

Ivan said that i had missed out much/missed out on a lot of fun when i had refused to go with him [keep him company] to the party.

[alk]

http://www.multitran.ru/c/m/a=TM&s=многое потеряла
http://www.multitran.ru/c/m/a=TM&s=много потеряла
http://www.multitran.ru/c/m/t=3378609_2_1

[fghjg]

ivan told that I lost an opportunity as I did not come along with him

[Nina79]

one of the many converstaional american versions:
Ivan said that I missed one hell of a party.
and some others:
Ivan said I missed a good one.
Ivan said I missed one hell of a good time
Ivan said that the party was a blast and that's too bad I missed it
Ivan said, you really shouldn't have missed THAT one!