поставьте предложение в отрицательную и вопросительные формы,
1 .He discusses a iot of guestions at the office.
2. They are discussing these guestions now.

1 .He doesn't discuss a lot of guestions at the office. does he discuss a lot of guestions at the office?

2. They aren't discussing these guestions now.

are they discussing these guestions now?