YOU SAID:

I was writing on my laptop when my sister called

INTO JAPANESE

姉が電話したとき、私はラップトップで書いていました

BACK INTO ENGLISH

I was writing on my laptop when my sister called

INTO JAPANESE

姉が電話したとき、私はラップトップで書いていました

BACK INTO ENGLISH

I was writing on my laptop when my sister called