Salut!
I was running in the park when I saw Simon.
I was sitting ... when my mobile phone rang.
(aici trebuie să fie o eroare la copierea exerciţiului, nu există "to sit in the lesson").
I was playing football when I broke my leg.
I was waiting for the buss when I heard a strange noise.
I was talking to a friend when you came back.
I was going to school when the rain started.
I was buying a drink when I saw a friend.
I was visiting France when I met my boyfriend.