以下是短文寫作中使用率最高、覆蓋面最廣的基本句式，每組句式的功能相同或相似，考生可根據(jù)自己的情況選擇其中的1-2個，做到能夠熟練正確地仿寫或套用。

　　4.表示重要、必要、困難、方便、可能

　　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.