1.while she was playing the piano, I was writing a
letter.2.he was going to the university,
when i met her.3.Our friends were discussing something when we interrupted
them.4.My mother was watching TV,
when I came into the room.5.I haven't seen him since he moved to his newflat.6.When I was
looking out of the window, I saw that it was raining hard and
people were hurrying along the
street.7.We were leaving the house, when the telephone rang.8.I
was sitting on the river bank , when my friends joined me.9.When
I came up to him, he was speaking to his friends.10.We met
her when she was walking home.11.When she entered the room ,I was standing
at the window.12.When we entered the
room he was smoking and speaking
to his friends.13.I was watching TV when somebody knocked at the
door.14.What were you doing ,when
I rang you up yesterday?15.Her son was cooking dinner, when she came
home. 16.She was watering the flowers, while her husband was
watching TV