写信目的:
(1)The purpose of this letter is to express my support for the plan to...
(2)I am writing to express my views on...
(3)I would like to take this opportunity to express my admiration for...
提出建议:
(1)It is high time that we took some effective measures to prevent...
(2)We should take some measures to prevent the problem from恶化.
(3)We should take prompt and effective measures to solve the problem.
对比:
(1)On the one hand,...on the other hand,...
(2)While there are advantages in both A and B, I believe that...
(3)Compared with A, B has many advantages, but...
原因:
(1)There are several factors that may account for this phenomenon.
(2)The reasons for this situation are as follows.
(3)The main reason for this is that...
利弊分析:
(1)Advantages: first, second, third. Disadvantages: first, second, third.
(2)There are two parts to this argument: on the one hand, ... on the other hand, ...
(3)There are several advantages in both arguments, but I believe that ...