1.I will call you right after I arrive at the station.
2.While we were planting trees, our friends were collecting rubbish.
3Before the choir went on stage, they practised for half an hour.
4When we follow the steps, we make a conical hat.
5Before my father bought me a computer, he taught me how to use one.
6After I read my favourite book, I went to bed.
7While Nick is reading a novel, Jack is reading a cartoon.
8Whenever my sister makes a mess, my mum makes her weed the garden.
9After the tornado hit, there were only a few houses left standing.
10When the bell rang, everyone raced out of the classroom.