1. They had just jumped into the water when the saw a shark swimming towards them.
2. I had just gone out when s/he called me.
3. I had just finished washing the dishes when my mother told me to iron the clothes.
4. I had not known about it until he told me.
5. He hadn't realized it until I told him.
Semoga membantu :)
Maaf kalau ada yang salah :(