1.She saw the shark while she was surfing
2. What did you do last night at 8:00pm?
3.I was reading a book when my brother got back
4.He didin't like the film very much.
5.What did he see while he was svimming
6.You can turn off the TV,im wasn't watching it
7.I was talking to Stephen while the phone was ranging ( По поводу этого не уверен)
8.I went to the cinema last light but i didint like the film