Перепишите предложения и переведите их на российский язык, обращая внимание на

Перепишите предложения и переведите их на русский язык, обращая внимание на различные значения глаголов to be, to have, to do
1. Fossil fuels are sources of energy that humans have taken advantage of over thousands of years.
2. Hydrogen, a simple, abundant element, has very high energy potential.
3. Many specialists do not believe that hydrogen is the fuel of the future.
4. The exam was to start in the afternoon.