Past Continuous when/while

I was singing a song ......she was drinking tea.

They were watching the film .....I came home.

I was climbing the tree ....I saw my friend.

My mum was cooking dinner.....the telephone rang.

I was eating my soup .....he came home.

They were drinking a cup of coffee ....they were sitting at that restaurant.

I was playing the guitar ....Jane was playing the drum.

Mike was doing his homework .....his friends were playing football.

I was studying ....she came.

I was studying .... he was making dinner.