YOU SAID:
Today I had a birthday party
INTO JAPANESE
今日私は誕生日パーティーをしました
BACK INTO ENGLISH
Today I did a birthday party
INTO JAPANESE
今日私は誕生日のパーティーをした
BACK INTO ENGLISH
Today I had a party for my birthday
INTO JAPANESE
今日私は私の誕生日のためのパーティーを持っていた
BACK INTO ENGLISH
Today I had a party for my birthday
That's deep, man.