1. Jack is video conferencing / having a video conference with his colleagues in Asia at the moment.

2. He said that he was doing well in science at school then.

3. Nick asked the professor why humans couldn't live on Mars.


4. Robots will replace humans in 30 years' time.

5. Many students asked me what the differences between Mars and Earth were.
 

1. Jack is having a video conference with his colleagues in Asia at the moment.

2. He said he did well in science at school then.

3. Nick asked the professor why humans cannot live on Mars.

4. Robots will replace humans in 30 years' time.

5. Many students ask me what the differences between Mars and Earth are.