1.说明事物现状
2. 事物本身的优缺点(或一方面)
3. 你对现状(或前景)的看法
例：
Nowadays many people prefer A because it has a significant role in our daily life. Generally, its advantages can be seen as follows. First ---------------(A的优点之一). Besides -------------------(A的优点之二).
But every coin has two sides. The negative aspects are also apparent. One of the important disadvantages is that ----------------(A的第一个缺点).To make matters worse,------------------(A的第二个缺点).
Through the above analysis, I believe that the positive aspects overweigh the negative ones. Therefore, I would like to ---------------(我的看法).
(From the comparison between these positive and negative effects of A, we should take it reasonably and do it according to the circumstances we are in. Only by this way, ---------------(对前景的预测).)