Один момент остается неясным. 10 предложений на английском в прошлом времени (отрицательные,вопросительные,утвердительные)

1) As he met a friend he hadn't seen for ages he stopped to talk to him.


2) What were you doing when it started to rain?


3) She didn't understand a word from what they said to her.


4) Why did your parents decide to get divorced?


5) When we came to the hotel we noticed a girl running in the hall.


6) Diana didn't pay anything for living in their flat.


7) While my aunt was watching TV all day long my uncle preferred walking outside.


Did you see your grandparents last weekend?


9) I was surprised to hear my best friend singing.


10) They didn't spend their vacations in Europe as they had planned.