Ответ:
When I was going (go) to the shops, I saw (see) my friend. When I saw (see) my friend, I said (say) ‘Hello!’ While we were talking (talk), a car ran into (run into) a man on a bike. When we saw (see) the accident, I phoned (phone) for an ambulance. While I was waiting(wait) for the ambulance, a policeman arrived (arrive). When the policeman arrived (arrive), he asked (ask) us some questions. The ambulance came (come), while I was talking (talk) to the policeman. The ambulance took (take) the man to hospital and we went (go) for a cup of coffee. While we were drinking (drink) our coffee, we were talking (talk) about the accident.