1)It is important(necessary,difficult,convenient,possible)for sb.to do sth.
2)We think it necessary to do sth. 3)It plays an important role in our life.
例如： Computers are now being used everywhere,whether in the government,in schools or in business.Soon,computers will be
found in every home,too.We have good reason to say that computers are playing an increasingly important role in our life and we
have stepped into the Computer Age.
2)We think it necessary to do sth. 3)It plays an important role in our life.
例如： Computers are now being used everywhere,whether in the government,in schools or in business.Soon,computers will be
found in every home,too.We have good reason to say that computers are playing an increasingly important role in our life and we
have stepped into the Computer Age.