YOU SAID:
I’m going to a party
INTO JAPANESE
パーティーに行くつもりです
BACK INTO ENGLISH
i'm going to a party
INTO JAPANESE
パーティーに行きます
BACK INTO ENGLISH
go to the party
INTO JAPANESE
パーティーへ行く
BACK INTO ENGLISH
go to the party
That didn't even make that much sense in English.