YOU SAID:
my computer had a party without me
INTO JAPANESE
私のコンピュータは私なしでパーティーをした
BACK INTO ENGLISH
My computer had a party without me.
INTO JAPANESE
私のコンピュータは私なしでパーティーをしました。
BACK INTO ENGLISH
My computer had a party without me.
That didn't even make that much sense in English.