YOU SAID:

My old grandma came to school and I had a lot going to go back and

INTO JAPANESE

私の古いおばあちゃんは学校に来て、私は戻って行くつもりだったし、

BACK INTO ENGLISH

My old grandma came to school, I was going back,

INTO JAPANESE

私の古いおばあちゃんは学校に来て、私は戻っていました、

BACK INTO ENGLISH

My old grandma came to school and I was back,

INTO JAPANESE

私の古いおばあちゃんが学校に来て、私は戻ってきました、

BACK INTO ENGLISH

My old grandma came to school and I came back,