YOU SAID:

i was at the lake with some of my friends and we were jumping off rocks and drinking beer

INTO JAPANESE

私は私の友人の何人かと湖にいた、そして我々は岩から飛び降りてビールを飲んでいた

BACK INTO ENGLISH

I was on the lake with some of my friends, and we were jumping off the rock and drinking beer

INTO JAPANESE

私は私の友人の何人かと一緒に湖にいました、そして我々は岩から飛び降りてビールを飲んでいました

BACK INTO ENGLISH

I was in the lake with some of my friends and we were jumping off the rock and drinking beer

INTO JAPANESE

私は何人かの友達と一緒に湖にいた、そして我々は岩から飛び降りてビールを飲んでいた

BACK INTO ENGLISH

I was in the lake with some friends, and we were jumping off the rock and drinking beer

INTO JAPANESE

私は何人かの友達と一緒に湖にいた、そして我々は岩から飛び降りてビールを飲んでいた

BACK INTO ENGLISH

I was in the lake with some friends, and we were jumping off the rock and drinking beer