1.Don't go in the sun unless you have a hat and sun cream.
2.Don't climb on your own unless you like heights.
3.Don't promise your friends a postcard unless you have time to write to them.
4.You get sunstroke unless you wear a hat in strong sun.
5.The sun can damage your eyes unless you wear sunglasses.
6.Post notes to yourself unless you have a very good memory.
