While I was baking a cake,my cat was sleeping.
When I saw him,he was playing volleyball.
While they were sunbathing ,I was swimming in the sea.
When he came into the classroom,the students were talking.
While he was riding a bike,I was walking in the park.
When the phone rang,I was having a shower.
While she was tidying up her room,her brother was doing the washing up.
When mother saw me,I was crossing the street.
While you were watching a movie,I was studying.
When he returned,we were waiting for him.