1. It/be/important/think/before speaking
It is important to think before speaking
2.sally/have/some letters / write
Sally has some letters written
3. It/be/not/possible/walk/on the streets after a specified hour
It isn't possible to walk on the streets after a specified hour
4.she /decide/go back/shop/buy/long dress
She decided to go back to that shop to buy that long dress