1. Yesterday's test was not short as today's.
=> Today's test more short than yesterday's.
2. Money is not as important as health.
=> Health is more important than money.
3. No-one in her family is fatter than him.
=> He is the fatest in her family.
4. He is hard-working than his friend.
=> His friend is not as hard-working as him.
5. Travelling by airplane is not as dangerous as travelling by car.
=> Travelling by car is more dangerous than travelling by airplane.
6. The Nile is the longest river in the world.
=> No- river in the world is longer than the Nile.