1. He is catching fish for dinner.

2. We are studying the climate.

3. Those crocodiles aren't sleeping.

4. I am watching a TV programme about polar bears.

5. They aren't doing their homework.

6. She is writing a book about whales.

7. You aren't listening to me.

1. Is the climate changing? Yes, it is.

2. Are tigers becoming extinct? Yes, they are.

3. Are you talking to Billy? No, I am not.

4. Is that female bear protecting her baby? Yes, it is.

5. Are we learning new vocabulary? Yes, we are.

6. Are your friends running in the park now? No, they're not.

7. Is Jack looking for his book? No, he isn't.