YOU SAID:
I went to a cool party last morning
INTO JAPANESE
私は昨晩クールなパーティーに行きました
BACK INTO ENGLISH
I went to a cool party last night.
INTO JAPANESE
私達は昨夜パーティーをした。
BACK INTO ENGLISH
We had a party last night.
INTO JAPANESE
私達は昨夜パーティーをした。
BACK INTO ENGLISH
We had a party last night.
Come on, you can do better than that.