表示原因
1）There are three reaon for thi．
2）The reaon for thi are a follow．
3）The reaon for thi i obviou．
4）The reaon for thi i not far to eek．
5）The reaon for thi i that．．．
6）We have good reaon to believe that．．．
例如：
There are three reaon for the change that have taken place in our life．Firtly，people’ living tandard ha been greatly improved．Secondly，mot people are well paid， and they can afford what they need or like．Lat but not leat，more and more people prefer to enjoy modern life．
注：如考生写第一个句子没有把握，可将其改写成两个句子。如：Great change have taken place in our life． There are three reaon for thi．这样写可以避免套用中的表达失误。
表示好处
1）It ha the following advantage．
2）It doe u a lot of good．
3）It benefit u quite a lot．
4）It i beneficial to u．
5）It i of great benefit to u．
例如：
Book are like friend．They can help u know the world better，and they can open our mind and widen our horizon．Therefore，reading extenively i of great benefit to u．
表示坏处
1）It ha more diadvantage than advantage．
2）It doe u much harm．[由www.hAozuowEn.com整理]
3）It i harmful to u．
例如：
However，everything divide into two．Televiion can alo be harmful to u．It can do harm to our health and make u lazy if we pend too much time watching televiion．
表示重要、必要、困难、方便、可能
1）It i important（neceary，difficult，convenient， poible）for b．to do th．
2）We think it neceary to do th．
3）It play an important role in our life．
例如：
Computer are now being ued everywhere，whether in the government，in chool or in buine．Soon， computer will be found in every home，too．We have good reaon to ay that computer are playing an increaingly important role in our life and we have tepped into the Computer Age．