I. Поставьте предложения в вопросительную и отрицательную формы.
1. The percentage of British exports in world trade declined significantly.
2. Business transactions usually start with enquiries.
3. Investing in infrastructure for industry will encourage economic growth.

1) The percentage of British exports in world trade didn't decline significantly.
Did the percentage of British exports in world trade decline significantly?
2) Business transactions don't usually start with enquiries.
Do business transactions usually start with enquiries?
3)Investing in infrastructure for industry won't encourage economic growth.
Will investing infrastructure for industry encourage economic growth?