Ответ:
1. Bob isn't old. He is young.
He isn't sad. He is happy.
A motorcycle isn't slow. It is fast.
2. The table isn't round. It is square.
The flowers aren't ugly. They are beautiful.
The windows aren't closed. They are open.
The chairs aren't hard. They are soft.
3. The blouse isn't old. It is new.
It isn't cheap. It is expensive.
The woman isn't happy. She is angry.