YOU SAID:

I went to a party last night with my friend

INTO JAPANESE

私は昨夜私の友人とパーティーに行きました

BACK INTO ENGLISH

I went to a party last night with a friend of mine

INTO JAPANESE

私は昨夜私の友達とパーティーに行きました

BACK INTO ENGLISH

I went to a party last night with my friends

INTO JAPANESE

私は昨夜友達とパーティーに行きました

BACK INTO ENGLISH

I went to a party with my friends last night.

INTO JAPANESE

私は昨夜友達とパーティーに行きました。

BACK INTO ENGLISH

I went to the party with my friends last night.

INTO JAPANESE

私は昨夜友達とパーティーに行きました。

BACK INTO ENGLISH

I went to the party with my friends last night.