造成这种情况的原因很多，但主要原因可归结为以下两个主要方面：
第一、在外语学习五项能力——听、说、读、写、译的训练方面，学生从中学到大学在听、说、读三项能力方面得到的训练比较多，而在写的能力上得到的培养最少，有时最基本的语句训练都是靠做选择项的形式来完成的，很少有真正动手写的机会；因而很多学生在做语法题或改错时有敏锐的辨别力，能够找出很复杂的语法错误，可是一旦自己真正动笔写，却错误多得不得了，而且很多都是最简单最基本的语法错误。所以，平时写的少，练的少，是构成写作困难的主要原因。
第二、不少学生缺乏对写作知识和写作技巧的了解和学习。他们一写作文，就感到脑子空空，不知如何下笔，写起来也是想到哪儿，写到哪儿，有时还东拼西凑，因而写作文时，常常是低水平上的重复，提高不快。
那么如何提高写作水平呢？笔者认为好的文章必须是自己独特的生活感受和艺术构思。然而，人非生而知之，写作也要经历一个过程，即学习—模仿—创新。常言道“巧妇难为无米之炊”，没有材料，再高明的作家也写不出好文章来。所以要写好作文首先必须扩大自己的阅读量，将一些好的文章背下来转化为自己的东西。
写作在初期的模仿是必要的，但经过一定的实践后，要打破框架，解放思路，不断创新，写出属于自己的文章。
本文最后给出一些考研英语写作常用句式给大家参考。
1. It is a common saying that man who has a settled purpose will surely succeed.
2. Upon hearing the unexpected news, he was so surprised that he couldn’t utter a word.
3. It must be kept in mind that there is no secret of success but hard work.
4. As the saying goes, nothing in the world is difficult for one who sets his mind to it.
5. It can be seen from this that there is no difficulty in the world we can overcome.
6. It must be admitted that you haven’t done what you promised to do.
7. All this shows that nothing can prevent us from reaching our aims.
8. Frankly speaking, what you call the truth may not apply to things happening here.
9. It is obvious (evident) that the success of the innovation depends on our concerted efforts.
10. It is true that we must redouble our efforts; otherwise we cannot catch up with the developed countries.
11. I take it for granted that they will support this idea. I regard it as natural that they will agree to this idea.
12. There is no denying the fact that the new management method has greatly increased the production.
