Fast -slow
Cheap -expensive
Small-big
Clean-dirty
Healthy-unhealthy
Quiet-noisy
Friendly-unfriendly
Old-modern
<span>I think people collect things because it is a favourite interesting hobby for them. Правильнее сказать так, рекомендую не строить предложения через онлайн-переводчик) </span>
2. You aren't ill.
3. We aren't right.
4. He isn't fifteen.
5. It isn't cold.
6. The school isn't in this street.
7. My books aren't in your bag.